\u5730\u7403\u4e0a\u306e\u5317\u7def \\(60^{\\circ}\\) \u6771\u7d4c \\(135^{\\circ}\\) \u306e\u5730\u70b9\u3092 A , \u5317\u7def \\(60^{\\circ}\\) \u6771\u7d4c \\(75^{\\circ}\\) \u306e\u5730\u70b9\u3092 B \u3068\u3059\u308b.\r\nA \u304b\u3089 B \u306b\u5411\u304b\u3046 \\(2\\) \u7a2e\u985e\u306e\u98db\u884c\u7d4c\u8def \\(R _ 1\\) , \\(R _ 2\\) \u3092\u8003\u3048\u308b.\r\n\\(R _ 1\\) \u306f\u897f\u306b\u5411\u304b\u3063\u3066\u540c\u4e00\u7def\u5ea6\u3067\u98db\u3076\u7d4c\u8def\u3068\u3059\u308b. \\(R _ 2\\) \u306f\u5730\u7403\u306e\u5927\u5186\u306b\u6cbf\u3063\u305f\u7d4c\u8def\u306e\u3046\u3061, \u98db\u884c\u8ddd\u96e2\u306e\u77ed\u3044\u65b9\u3068\u3059\u308b.\r\n\\(R _ 1\\) \u306b\u6bd4\u3079\u3066 \\(R _ 2\\) \u306f\u98db\u884c\u8ddd\u96e2\u304c \\(3 \\%\\) \u4ee5\u4e0a\u77ed\u304f\u306a\u308b\u3053\u3068\u3092\u793a\u305b.\r\n\u305f\u3060\u3057, \u5730\u7403\u306f\u5b8c\u5168\u306a\u7403\u4f53\u3067\u3042\u308b\u3068\u3057, \u98db\u884c\u6a5f\u306f\u9ad8\u5ea6 \\(0\\) \u3092\u98db\u3076\u3082\u306e\u3068\u3059\u308b. \u307e\u305f\u5fc5\u8981\u304c\u3042\u308c\u3070, \u3053\u306e\u518a\u5b50\u306e \\(5\\) \u30da\u30fc\u30b8\u3068 \\(6\\) \u30da\u30fc\u30b8\u306e\u4e09\u89d2\u95a2\u6570\u8868\u3092\u7528\u3044\u3088.
\r\n\u6ce8\uff1a\u5927\u5186\u3068\u306f, \u7403\u3092\u7403\u306e\u4e2d\u5fc3\u3092\u901a\u308b\u5e73\u9762\u3067\u5207\u3063\u305f\u3068\u304d, \u305d\u306e\u5207\u308a\u53e3\u306b\u3067\u304d\u308b\u5186\u306e\u3053\u3068\u3067\u3042\u308b.
\r\n\u203b \u5f53\u30b5\u30a4\u30c8\u3067\u306f, \u4e09\u89d2\u95a2\u6570\u8868\u306f\u7701\u7565\u3057\u307e\u3059.<\/p>\r\n
\u5730\u7403\u306e\u534a\u5f84\u3092 \\(r\\) \u3068\u304a\u304f.
\r\n\u5317\u7def \\(60^{\\circ}\\) \u306e\u7dda\u304c\u4f5c\u308b\u5186\u306e\u534a\u5f84\u306f, \\(r \\sin 30^{\\circ} =\\dfrac{r}{2}\\) \u306a\u306e\u3067\r\n\\[\r\nR _ 1 =2 \\pi \\cdot \\dfrac{r}{2} \\cdot \\dfrac{60^{\\circ}}{360^{\\circ}} =\\dfrac{\\pi r}{6}\r\n\\]\r\n\\(\\text{AB} =\\dfrac{r}{2}\\) \u306a\u306e\u3067, \u5927\u5186\u306b\u304a\u3051\u308b\u5f27AB\u306e\u4e2d\u5fc3\u89d2\u3092 \\(\\alpha\\) \u3068\u304a\u3051\u3070\r\n\\[\\begin{align}\r\n2 r \\sin \\dfrac{\\alpha}{2} & = \\dfrac{r}{2} \\\\\r\n\\text{\u2234} \\quad \\sin \\dfrac{\\alpha}{2} & =\\dfrac{1}{4}\r\n\\end{align}\\]\r\n\u4e09\u89d2\u95a2\u6570\u8868\u3088\u308a, \\(\\sin 14.5^{\\circ} = 0.2504\\) \u306a\u306e\u3067\r\n\\[\\begin{align}\r\n\\dfrac{\\alpha}{2} & \\lt 14.5^{\\circ} \\\\\r\n\\text{\u2234} \\quad \\alpha & \\lt 29^{\\circ}\r\n\\end{align}\\]\r\n\u3057\u305f\u304c\u3063\u3066\r\n\\[\r\nR _ 2 \\lt 2 \\pi r \\cdot \\dfrac{29^{\\circ}}{360^{\\circ}} =\\dfrac{29 \\pi r}{180}\r\n\\]\r\n\u3088\u3063\u3066\r\n\\[\r\n\\dfrac{R _ 2}{R _ 1} \\lt \\dfrac{29}{30} \\lt 0.97\r\n\\]\r\n\u3059\u306a\u308f\u3061, \u984c\u610f\u306f\u793a\u3055\u308c\u305f.<\/p>\r\n","protected":false},"excerpt":{"rendered":"\u5730\u7403\u4e0a\u306e\u5317\u7def \\(60^{\\circ}\\) \u6771\u7d4c \\(135^{\\circ}\\) \u306e\u5730\u70b9\u3092 A , \u5317\u7def \\(60^{\\circ}\\) \u6771\u7d4c \\(75^{\\circ}\\) \u306e\u5730\u70b9\u3092 B \u3068\u3059\u308b. A \u304b\u3089 B \u306b\u5411\u304b\u3046 … \u7d9a\u304d\u3092\u8aad\u3080