半径0.5の外接円を持つ正n角形の周の長さ

a.ipynb

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    "import pandas as pd\n",
    "import numpy as np\n",
    "df = pd.DataFrame([(n, n * np.sin(np.pi/n)) for n in range(3, 100)], columns=['n', '半径0.5の外接円を持つ正n角形の周の長さ'])\n",
    "indices = df[df['半径0.5の外接円を持つ正n角形の周の長さ'] > 3].index\n",
    "df.loc[indices-2].head(3)"
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       "   n  半径0.5の外接円を持つ正n角形の周の長さ\n",
       "2  5               2.938926\n",
       "3  6               3.000000\n",
       "4  7               3.037186"
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   "source": [
    "indices = df[df['半径0.5の外接円を持つ正n角形の周の長さ'] > 3.14].index\n",
    "df.loc[indices-1].head(3)"
   ],
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       "      <th>半径0.5の外接円を持つ正n角形の周の長さ</th>\n",
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       "     n  半径0.5の外接円を持つ正n角形の周の長さ\n",
       "53  56               3.139945\n",
       "54  57               3.140002\n",
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   "source": [
    "indices = df[df['半径0.5の外接円を持つ正n角形の周の長さ'] > 3.141].index\n",
    "df.loc[indices-1].head(3)"
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       "     n  半径0.5の外接円を持つ正n角形の周の長さ\n",
       "90  93               3.140995\n",
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