{"id":959,"date":"2026-10-02T14:00:55","date_gmt":"2026-10-02T05:00:55","guid":{"rendered":"https:\/\/www.risu-japan.com\/drill\/?p=959"},"modified":"2026-10-02T14:00:55","modified_gmt":"2026-10-02T05:00:55","slug":"sphere-properties","status":"publish","type":"drill","link":"https:\/\/www.risu-japan.com\/drill\/grade3\/circles-and-triangles\/sphere-properties\/","title":{"rendered":"\u7403\u306e\u6027\u8cea\u3068\u56f3"},"content":{"rendered":"<p><!-- body-start --><\/p>\n<h2>\u7403\u306e \u6027\u8cea<\/h2>\n<p>\u30dc\u30fc\u30eb\u306e\u3088\u3046\u306a\u3001\u3069\u3053\u304b\u3089\u898b\u3066\u3082\u300c\u5186\u300d\u306b\u898b\u3048\u308b\u4e38\u3044\u5f62\u3092\u300c\u7403\uff08\u304d\u3085\u3046\uff09\u300d\u3068\u3044\u3044\u307e\u3059\u3002<\/p>\n<p>\u7403\u306e\u4e2d\u306b\u3082\u3001\u5186\u3068\u540c\u3058\u3088\u3046\u306b\u300c\u4e2d\u5fc3\u300d\u300c\u534a\u5f84\u300d\u300c\u76f4\u5f84\u300d\u304c\u3042\u308a\u307e\u3059\u3002\u7403\u306e\u300c\u4e2d\u5fc3\u300d\u306f\u3061\u3087\u3046\u3069\u771f\u3093\u4e2d\u306e\u70b9\u3067\u3042\u308a\u3001\u305d\u3053\u304b\u3089\u7403\u306e\u8868\u9762\uff08\u307e\u308f\u308a\uff09\u307e\u3067\u306e\u8ddd\u96e2\u306f\u3069\u3053\u3092\u6e2c\u3063\u3066\u3082\u540c\u3058\u306b\u306a\u308a\u307e\u3059\u3002\u307e\u305f\u3001\u4e2d\u5fc3\u304b\u3089\u8868\u9762\u307e\u3067\u306e\u9577\u3055\u3092\u300c\u534a\u5f84\u300d\u3001\u4e2d\u5fc3\u3092\u901a\u3063\u3066\u8868\u9762\u304b\u3089\u8868\u9762\u307e\u3067\u307e\u3063\u3059\u3050\u7d50\u3093\u3060\u9577\u3055\u3092\u300c\u76f4\u5f84\u300d\u3068\u3044\u3044\u307e\u3059\u3002<\/p>\n<p>\u7403\u3092\u3069\u3053\u3067\u5207\u3063\u3066\u3082\u3001\u5207\u308a\u53e3\u306f\u5fc5\u305a\u300c\u5186\u300d\u306b\u306a\u308a\u307e\u3059\u3002\u305d\u3057\u3066\u3001\u7403\u306e\u300c\u4e2d\u5fc3\u3092\u901a\u308b\u3088\u3046\u306b\u300d\u534a\u5206\u306b\u5207\u3063\u305f\u3068\u304d\u3001\u5207\u308a\u53e3\u306e\u5186\u304c\u4e00\u756a\u5927\u304d\u304f\u306a\u308a\u307e\u3059\u3002<\/p>\n<p><img loading=\"lazy\" decoding=\"async\" src=\"https:\/\/www.risu-japan.com\/drill\/wp-content\/uploads\/2026\/08\/2026-08-22_15-58-43_323801.jpg\" alt=\"\" width=\"1024\" height=\"559\" class=\"alignnone size-full wp-image-1075\" srcset=\"https:\/\/www.risu-japan.com\/drill\/wp-content\/uploads\/2026\/08\/2026-08-22_15-58-43_323801.jpg 1024w, https:\/\/www.risu-japan.com\/drill\/wp-content\/uploads\/2026\/08\/2026-08-22_15-58-43_323801-300x164.jpg 300w, https:\/\/www.risu-japan.com\/drill\/wp-content\/uploads\/2026\/08\/2026-08-22_15-58-43_323801-768x419.jpg 768w\" sizes=\"auto, (max-width: 1024px) 100vw, 1024px\" \/><\/p>\n<h2>\u7403\u306e \u8a08\u7b97\u30eb\u30fc\u30eb<\/h2>\n<h3>1. \u76f4\u5f84\u306e\u6c42\u3081\u65b9<\/h3>\n<p>\u7403\u306e\u76f4\u5f84 <span class=\"risu-math risu-math--inline\"><math xmlns=\"http:\/\/www.w3.org\/1998\/Math\/MathML\" display=\"inline\"><mo>=<\/mo><\/math><\/span> \u7403\u306e\u534a\u5f84 <span class=\"risu-math risu-math--inline\"><math xmlns=\"http:\/\/www.w3.org\/1998\/Math\/MathML\" display=\"inline\"><mo>\u00d7<\/mo><mn>2<\/mn><\/math><\/span><\/p>\n<h3>2. \u7403\u306e\u56f3\u306e\u304b\u304d\u65b9<\/h3>\n<p>\u7403\u306e\u56f3\u3092\u304b\u304f\u3068\u304d\u306f\u30011\u3064\u306e\u5186\u3092\u304b\u304d\u3001\u305d\u306e\u4e2d\u306b\u6a2a\u304b\u3089\u898b\u305f\u5207\u308a\u53e3\u3068\u306a\u308b\u300c\u3060\u5186\uff08\u6a2a\u9577\u306b\u3064\u3076\u308c\u305f\u5186\uff09\u300d\u3092\u70b9\u7dda\u3068\u5b9f\u7dda\u3067\u304b\u304d\u307e\u3059\u3002<\/p>\n<p><!-- \u4f8b\u984c --><\/p>\n<section class=\"example-section\">\n<h2 class=\"example-section__heading\">\u4f8b\u984c<\/h2>\n<div class=\"problem-card\">\n<h3 class=\"problem-card__num\">\u554f1<\/h3>\n<p>1\u8fba\u304c <span class=\"risu-math risu-math--inline\"><math xmlns=\"http:\/\/www.w3.org\/1998\/Math\/MathML\" display=\"inline\"><mn>20<\/mn><mtext>cm<\/mtext><\/math><\/span> \u306e \u7acb\u65b9\u4f53\u306e \u7bb1\u306b\u3001\u30dc\u30fc\u30eb\uff08\u7403\uff09\u304c \u3074\u3063\u305f\u308a \u5165\u3063\u3066 \u3044\u307e\u3059\u3002\u3053\u306e \u7403\u306e \u76f4\u5f84\u3068 \u534a\u5f84\u306f\u3001\u305d\u308c\u305e\u308c \u4f55cm\u3067\u3059\u304b\u3002<\/p>\n<p>    <img loading=\"lazy\" decoding=\"async\" src=\"https:\/\/www.risu-japan.com\/drill\/wp-content\/uploads\/2026\/08\/A-diagram-showing-a-sphere-fitting-perfectly-inside-a-cubic-box.-The-side-length-of-the-box-is-20-cm-300x300.jpg\" alt=\"\" width=\"300\" height=\"300\" class=\"alignnone size-medium wp-image-961\" srcset=\"https:\/\/www.risu-japan.com\/drill\/wp-content\/uploads\/2026\/08\/A-diagram-showing-a-sphere-fitting-perfectly-inside-a-cubic-box.-The-side-length-of-the-box-is-20-cm-300x300.jpg 300w, https:\/\/www.risu-japan.com\/drill\/wp-content\/uploads\/2026\/08\/A-diagram-showing-a-sphere-fitting-perfectly-inside-a-cubic-box.-The-side-length-of-the-box-is-20-cm-150x150.jpg 150w, https:\/\/www.risu-japan.com\/drill\/wp-content\/uploads\/2026\/08\/A-diagram-showing-a-sphere-fitting-perfectly-inside-a-cubic-box.-The-side-length-of-the-box-is-20-cm.jpg 600w\" sizes=\"auto, (max-width: 300px) 100vw, 300px\" \/>\n  <\/div>\n<div class=\"problem-card\">\n<h3 class=\"problem-card__num\">\u554f2<\/h3>\n<p>\u7403\u3092 \u5207\u308b \u3068\u304d\u3001\u5207\u308a\u53e3\u304c \u4e00\u756a \u5927\u304d\u306a \u5186\u306b \u306a\u308b\u306e\u306f\u3001\u3069\u3053\u3092 \u901a\u308b\u3088\u3046\u306b \u5207\u3063\u305f \u3068\u304d\u3067\u3059\u304b\u3002<\/p>\n<\/p><\/div>\n<div class=\"explanation-block\">\n<h3 class=\"explanation-block__heading\">\u89e3\u8aac<\/h3>\n<div class=\"explanation-card\">\n<h4 class=\"explanation-card__num\">\u554f1<\/h4>\n<p>\u7acb\u65b9\u4f53\u306b\u7403\u304c\u3074\u3063\u305f\u308a\u3068\u5165\u3063\u3066\u3044\u308b\u6642\u3001\u7acb\u65b9\u4f53\u306e1\u8fba\u306e\u9577\u3055\u3068\u7403\u306e\u76f4\u5f84\u306e\u9577\u3055\u304c\u540c\u3058\u306b\u306a\u308b\u306e\u3067\u76f4\u5f84\u306e\u9577\u3055\u306f <span class=\"risu-math risu-math--inline\"><math xmlns=\"http:\/\/www.w3.org\/1998\/Math\/MathML\" display=\"inline\"><mn>20<\/mn><mtext>cm<\/mtext><\/math><\/span> \u3067\u3059\u3002\u76f4\u5f84\u306e\u9577\u3055\u30922\u5206\u306e1\u3059\u308b\u3068\u534a\u5f84\u306e\u9577\u3055\u306b\u306a\u308b\u306e\u3067\u3001<span class=\"risu-math risu-math--inline\"><math xmlns=\"http:\/\/www.w3.org\/1998\/Math\/MathML\" display=\"inline\"><mn>20<\/mn><mtext>cm<\/mtext><\/math><\/span> \u30922\u5206\u306e1\u3057\u3066 <span class=\"risu-math risu-math--inline\"><math xmlns=\"http:\/\/www.w3.org\/1998\/Math\/MathML\" display=\"inline\"><mn>10<\/mn><mtext>cm<\/mtext><\/math><\/span> \u304c\u534a\u5f84\u306e\u9577\u3055\u306b\u306a\u308a\u307e\u3059\u3002<\/p>\n<p>\u7b54\u3048\uff1a\u76f4\u5f84 20cm\u3001\u534a\u5f84 10cm<\/p>\n<div class=\"risu-math risu-math--block\"><math xmlns=\"http:\/\/www.w3.org\/1998\/Math\/MathML\" display=\"block\"><mn>20<\/mn><mo>\u00f7<\/mo><mn>2<\/mn><mo>=<\/mo><mn>10<\/mn><\/math><\/div>\n<\/p><\/div>\n<div class=\"explanation-card\">\n<h4 class=\"explanation-card__num\">\u554f2<\/h4>\n<p>\u7403\u306e\u4e2d\u5fc3\u3092\u901a\u308b\u3088\u3046\u306b\u7403\u3092\u5207\u308b\u3068\u3001\u5207\u308a\u53e3\u304c\u6700\u3082\u5927\u304d\u3044\u5186\u306b\u306a\u308a\u307e\u3059\u3002\u3053\u306e\u3068\u304d\u5186\u306e\u534a\u5f84\u306f\u7403\u306e\u534a\u5f84\u3068\u540c\u3058\u306b\u306a\u308a\u307e\u3059\u3002<\/p>\n<p>\u7b54\u3048\uff1a\u7403\u306e\u4e2d\u5fc3<\/p>\n<\/p><\/div>\n<\/p><\/div>\n<\/section>\n<p><!-- \u7df4\u7fd2\u554f\u984c --><\/p>\n<section class=\"practice-problems\">\n<h2>\u7df4\u7fd2\u554f\u984c<\/h2>\n<div class=\"problem-card\">\n<h3 class=\"problem-card__num\">\u554f1<\/h3>\n<p>\u534a\u5f84\u304c <span class=\"risu-math risu-math--inline\"><math xmlns=\"http:\/\/www.w3.org\/1998\/Math\/MathML\" display=\"inline\"><mn>15<\/mn><mtext>cm<\/mtext><\/math><\/span> \u306e \u7403\u306e \u76f4\u5f84\u306f \u4f55cm\u3067\u3059\u304b\u3002<\/p>\n<\/p><\/div>\n<div class=\"problem-card\">\n<h3 class=\"problem-card__num\">\u554f2<\/h3>\n<p>\u534a\u5f84 <span class=\"risu-math risu-math--inline\"><math xmlns=\"http:\/\/www.w3.org\/1998\/Math\/MathML\" display=\"inline\"><mn>13<\/mn><mtext>cm<\/mtext><\/math><\/span> \u306e \u7403\u304c \u3074\u3063\u305f\u308a \u5165\u308b \u56db\u89d2\u3044 \u7bb1\u3092 \u4f5c\u308a\u307e\u3059\u3002\u7bb1\u306e 1\u3064\u306e \u8fba\u306f \u4f55cm\u306b \u3059\u308c\u3070 \u3088\u3044\u3067\u3059\u304b\u3002<\/p>\n<\/p><\/div>\n<div class=\"problem-card\">\n<h3 class=\"problem-card__num\">\u554f3<\/h3>\n<p>\u56f3\u3092 \u53c2\u8003\u306b\u3001\u30ce\u30fc\u30c8\u306b \u7403\u3092 \u304b\u304d\u307e\u3057\u3087\u3046\u3002<\/p>\n<p>    <img loading=\"lazy\" decoding=\"async\" src=\"https:\/\/www.risu-japan.com\/drill\/wp-content\/uploads\/2026\/08\/Diagram-of-a-sphere1-300x237.jpg\" alt=\"\" width=\"300\" height=\"237\" class=\"alignnone size-medium wp-image-963\" srcset=\"https:\/\/www.risu-japan.com\/drill\/wp-content\/uploads\/2026\/08\/Diagram-of-a-sphere1-300x237.jpg 300w, https:\/\/www.risu-japan.com\/drill\/wp-content\/uploads\/2026\/08\/Diagram-of-a-sphere1.jpg 600w\" sizes=\"auto, (max-width: 300px) 100vw, 300px\" \/>\n  <\/div>\n<\/section>\n<p><!-- \u5fdc\u7528\u554f\u984c --><\/p>\n<section class=\"advanced-problems\">\n<h2>\u5fdc\u7528\u554f\u984c<\/h2>\n<div class=\"problem-card\">\n<h3 class=\"problem-card__num\">\u554f1<\/h3>\n<p>\u7b52\u306e \u4e2d\u306b \u30dc\u30fc\u30eb\u304c 3\u3064 \u3074\u3063\u305f\u308a \u91cd\u306a\u3063\u3066 \u5165\u3063\u3066 \u3044\u307e\u3059\u3002\u7b52\u306e \u9ad8\u3055\u306f <span class=\"risu-math risu-math--inline\"><math xmlns=\"http:\/\/www.w3.org\/1998\/Math\/MathML\" display=\"inline\"><mn>24<\/mn><mtext>cm<\/mtext><\/math><\/span> \u3067\u3059\u3002\u30dc\u30fc\u30eb 1\u3064\u306e \u534a\u5f84\u306f \u4f55cm\u3067\u3059\u304b\u3002<\/p>\n<p>    <img loading=\"lazy\" decoding=\"async\" src=\"https:\/\/www.risu-japan.com\/drill\/wp-content\/uploads\/2026\/08\/A-diagram-showing-three-spheres-of-the-same-size-fitting-perfectly-stacked-vertically-inside-a-cylinder-300x300.jpg\" alt=\"\" width=\"300\" height=\"300\" class=\"alignnone size-medium wp-image-964\" srcset=\"https:\/\/www.risu-japan.com\/drill\/wp-content\/uploads\/2026\/08\/A-diagram-showing-three-spheres-of-the-same-size-fitting-perfectly-stacked-vertically-inside-a-cylinder-300x300.jpg 300w, https:\/\/www.risu-japan.com\/drill\/wp-content\/uploads\/2026\/08\/A-diagram-showing-three-spheres-of-the-same-size-fitting-perfectly-stacked-vertically-inside-a-cylinder-150x150.jpg 150w, https:\/\/www.risu-japan.com\/drill\/wp-content\/uploads\/2026\/08\/A-diagram-showing-three-spheres-of-the-same-size-fitting-perfectly-stacked-vertically-inside-a-cylinder.jpg 600w\" sizes=\"auto, (max-width: 300px) 100vw, 300px\" \/>\n  <\/div>\n<div class=\"problem-card\">\n<h3 class=\"problem-card__num\">\u554f2<\/h3>\n<p>\u7403\u3092 \u5207\u3063\u305f \u3068\u304d\u306e \u5207\u308a\u53e3\u306f\u3001\u3069\u3093\u306a \u89d2\u5ea6\u304b\u3089 \u5207\u3063\u3066\u3082 \u540c\u3058 \u5f62\u306b \u306a\u308a\u307e\u3059\u3002\u4f55\u3068\u3044\u3046 \u5f62\u3067\u3059\u304b\u3002<\/p>\n<\/p><\/div>\n<div class=\"problem-card\">\n<h3 class=\"problem-card__num\">\u554f3<\/h3>\n<p>\u76f4\u5f84\u304c <span class=\"risu-math risu-math--inline\"><math xmlns=\"http:\/\/www.w3.org\/1998\/Math\/MathML\" display=\"inline\"><mn>7<\/mn><mtext>cm<\/mtext><\/math><\/span> \u306e \u7389\u3068\u3001\u534a\u5f84\u304c <span class=\"risu-math risu-math--inline\"><math xmlns=\"http:\/\/www.w3.org\/1998\/Math\/MathML\" display=\"inline\"><mn>4<\/mn><mtext>cm<\/mtext><\/math><\/span> \u306e \u7389\u304c \u3042\u308a\u307e\u3059\u3002\u3069\u3061\u3089\u304c \u5927\u304d\u3044\u3067\u3059\u304b\u3002<\/p>\n<\/p><\/div>\n<\/section>\n<p><!-- \u89e3\u7b54\u3068\u89e3\u8aac --><\/p>\n<section class=\"answer-section\">\n<h2>\u89e3\u7b54\u3068\u89e3\u8aac<\/h2>\n<div class=\"answer-group answer-group--practice\">\n<h3>\u7df4\u7fd2\u554f\u984c<\/h3>\n<div class=\"explanation-card\">\n<h4 class=\"explanation-card__num\">\u554f1<\/h4>\n<p>\u534a\u5f84\u306e\u9577\u3055\u30922\u500d\u3059\u308b\u3068\u76f4\u5f84\u306e\u9577\u3055\u306b\u306a\u308b\u306e\u3067\u3001<span class=\"risu-math risu-math--inline\"><math xmlns=\"http:\/\/www.w3.org\/1998\/Math\/MathML\" display=\"inline\"><mn>15<\/mn><mtext>cm<\/mtext><\/math><\/span> \u30922\u500d\u3057\u3066 <span class=\"risu-math risu-math--inline\"><math xmlns=\"http:\/\/www.w3.org\/1998\/Math\/MathML\" display=\"inline\"><mn>30<\/mn><mtext>cm<\/mtext><\/math><\/span> \u304c\u76f4\u5f84\u306e\u9577\u3055\u306b\u306a\u308a\u307e\u3059\u3002<\/p>\n<p>\u7b54\u3048\uff1a30cm<\/p>\n<div class=\"risu-math risu-math--block\"><math xmlns=\"http:\/\/www.w3.org\/1998\/Math\/MathML\" display=\"block\"><mn>15<\/mn><mo>\u00d7<\/mo><mn>2<\/mn><mo>=<\/mo><mn>30<\/mn><\/math><\/div>\n<\/p><\/div>\n<div class=\"explanation-card\">\n<h4 class=\"explanation-card__num\">\u554f2<\/h4>\n<p>\u7bb1\u306b\u7403\u304c\u3074\u3063\u305f\u308a\u5165\u3063\u3066\u3044\u308b\u6642\u3001\u7bb1\u306e1\u8fba\u306e\u9577\u3055\u306f\u7403\u306e\u76f4\u5f84\u3068\u7b49\u3057\u304f\u306a\u308a\u307e\u3059\u3002\u534a\u5f84\u306e\u9577\u3055\u30922\u500d\u3059\u308b\u3068\u76f4\u5f84\u306e\u9577\u3055\u306b\u306a\u308b\u306e\u3067\u3001<span class=\"risu-math risu-math--inline\"><math xmlns=\"http:\/\/www.w3.org\/1998\/Math\/MathML\" display=\"inline\"><mn>13<\/mn><mtext>cm<\/mtext><\/math><\/span> \u30922\u500d\u3057\u3066 <span class=\"risu-math risu-math--inline\"><math xmlns=\"http:\/\/www.w3.org\/1998\/Math\/MathML\" display=\"inline\"><mn>26<\/mn><mtext>cm<\/mtext><\/math><\/span> \u304c\u7b54\u3048\u306b\u306a\u308a\u307e\u3059\u3002<\/p>\n<p>\u7b54\u3048\uff1a26cm<\/p>\n<div class=\"risu-math risu-math--block\"><math xmlns=\"http:\/\/www.w3.org\/1998\/Math\/MathML\" display=\"block\"><mn>13<\/mn><mo>\u00d7<\/mo><mn>2<\/mn><mo>=<\/mo><mn>26<\/mn><\/math><\/div>\n<\/p><\/div>\n<div class=\"explanation-card\">\n<h4 class=\"explanation-card__num\">\u554f3<\/h4>\n<p>\u7403\u306e\u898b\u53d6\u308a\u56f3\u3092\u63cf\u304f\u3068\u304d\u306f\u3001\u307e\u305a\u5186\u3092\u63cf\u3044\u3066\u305d\u3053\u306b\u7acb\u4f53\u611f\u3092\u51fa\u3059\u305f\u3081\u306b\u6955\u5186\u306e\u4e0a\u534a\u5206\u3092\u70b9\u7dda\u3001\u4e0b\u534a\u5206\u3092\u5b9f\u7dda\u3067\u66f8\u304d\u307e\u3059\u3002<\/p>\n<\/p><\/div>\n<\/p><\/div>\n<div class=\"answer-group answer-group--advanced\">\n<h3>\u5fdc\u7528\u554f\u984c<\/h3>\n<div class=\"explanation-card\">\n<h4 class=\"explanation-card__num\">\u554f1<\/h4>\n<p>\u30dc\u30fc\u30eb\u304c3\u3053\u5165\u3063\u305f\u7b52\u304c <span class=\"risu-math risu-math--inline\"><math xmlns=\"http:\/\/www.w3.org\/1998\/Math\/MathML\" display=\"inline\"><mn>24<\/mn><mtext>cm<\/mtext><\/math><\/span> 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display=\"inline\"><mn>4<\/mn><mtext>cm<\/mtext><\/math><\/span> \u304c\u7b54\u3048\u306b\u306a\u308a\u307e\u3059\u3002<\/p>\n<p>\u7b54\u3048\uff1a4cm<\/p>\n<div class=\"risu-math risu-math--block\"><math xmlns=\"http:\/\/www.w3.org\/1998\/Math\/MathML\" display=\"block\"><mn>24<\/mn><mo>\u00f7<\/mo><mn>3<\/mn><mo>=<\/mo><mn>8<\/mn><\/math><\/div>\n<div class=\"risu-math risu-math--block\"><math xmlns=\"http:\/\/www.w3.org\/1998\/Math\/MathML\" display=\"block\"><mn>8<\/mn><mo>\u00f7<\/mo><mn>2<\/mn><mo>=<\/mo><mn>4<\/mn><\/math><\/div>\n<\/p><\/div>\n<div class=\"explanation-card\">\n<h4 class=\"explanation-card__num\">\u554f2<\/h4>\n<p>\u7403\u306f\u3069\u3093\u306a\u89d2\u5ea6\u304b\u3089\u5207\u3063\u3066\u3082\u3001\u305d\u306e\u5207\u308a\u53e3\u306f\u5186\u306b\u306a\u308a\u307e\u3059\u3002<\/p>\n<p>\u7b54\u3048\uff1a\u5186<\/p>\n<\/p><\/div>\n<div class=\"explanation-card\">\n<h4 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xmlns=\"http:\/\/www.w3.org\/1998\/Math\/MathML\" display=\"inline\"><mn>8<\/mn><mtext>cm<\/mtext><\/math><\/span> \u306a\u306e\u3067\u3001\u534a\u5f84 <span class=\"risu-math risu-math--inline\"><math xmlns=\"http:\/\/www.w3.org\/1998\/Math\/MathML\" display=\"inline\"><mn>4<\/mn><mtext>cm<\/mtext><\/math><\/span> \u306e\u7389\u306e\u65b9\u304c\u5927\u304d\u304f\u306a\u308b\u3068\u5206\u304b\u308a\u307e\u3059\u3002<\/p>\n<p>\u7b54\u3048\uff1a\u534a\u5f84\u304c4cm\u306e\u7389<\/p>\n<div class=\"risu-math risu-math--block\"><math xmlns=\"http:\/\/www.w3.org\/1998\/Math\/MathML\" display=\"block\"><mn>4<\/mn><mo>\u00d7<\/mo><mn>2<\/mn><mo>=<\/mo><mn>8<\/mn><\/math><\/div>\n<\/p><\/div>\n<\/p><\/div>\n<\/section>\n<p><!-- \u5b66\u7fd2\u306e\u30a2\u30c9\u30d0\u30a4\u30b9 --><\/p>\n<aside class=\"advice-box\">\n<h2 class=\"advice-box__heading\">\u5b66\u7fd2\u306e\u30a2\u30c9\u30d0\u30a4\u30b9<\/h2>\n<div 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