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<table>
<tbody>
<tr>
<td></td>
<td style="text-align: center;"><span class="red b">1</span></td>
<td style="text-align: center;"><span class="red b">2</span></td>
<td style="text-align: center;"><span class="red b">3</span></td>
<td style="text-align: center;"><span class="red b">4</span></td>
<td style="text-align: center;"><span class="red b">5</span></td>
<td style="text-align: center;"><span class="red b">6</span></td>
</tr>
<tr>
<td style="text-align: center;"><span class="blue b">1</span></td>
<td style="text-align: center;">1</td>
<td style="text-align: center;">2</td>
<td style="text-align: center;">3</td>
<td style="text-align: center;">4</td>
<td style="text-align: center;">5</td>
<td style="text-align: center;">6</td>
</tr>
<tr>
<td style="text-align: center;"><span class="blue b">2</span></td>
<td style="text-align: center;">2</td>
<td style="text-align: center;">4</td>
<td style="text-align: center;">6</td>
<td style="text-align: center;">8</td>
<td style="text-align: center;">10</td>
<td style="text-align: center;">12</td>
</tr>
<tr>
<td style="text-align: center;"><span class="blue b">3</span></td>
<td style="text-align: center;">3</td>
<td style="text-align: center;">6</td>
<td style="text-align: center;">9</td>
<td style="text-align: center;">12</td>
<td style="text-align: center;">15</td>
<td style="text-align: center;">18</td>
</tr>
<tr>
<td style="text-align: center;"><span class="blue b">4</span></td>
<td style="text-align: center;">4</td>
<td style="text-align: center;">8</td>
<td style="text-align: center;">12</td>
<td style="text-align: center;">16</td>
<td style="text-align: center;">20</td>
<td style="text-align: center;">24</td>
</tr>
<tr>
<td style="text-align: center;"><span class="blue b">5</span></td>
<td style="text-align: center;">5</td>
<td style="text-align: center;">10</td>
<td style="text-align: center;">15</td>
<td style="text-align: center;">20</td>
<td style="text-align: center;">25</td>
<td style="text-align: center;">30</td>
</tr>
<tr>
<td style="text-align: center;"><span class="blue b">6</span></td>
<td style="text-align: center;">6</td>
<td style="text-align: center;">12</td>
<td style="text-align: center;">18</td>
<td style="text-align: center;">24</td>
<td style="text-align: center;">30</td>
<td style="text-align: center;">36</td>
</tbody>
</table>
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ä¸ã®é»æ°åããã®ç©ã«ãªã£ã¦ãã¾ãã<br />
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ã\(4ï¼6ï¼8ï¼10ï¼12ï¼\cdots\)<br />
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<table>
<tbody>
<tr>
<td></td>
<td style="text-align: center;"><span class="red b">1</span></td>
<td style="text-align: center;"><span class="red b">2</span></td>
<td style="text-align: center;"><span class="red b">3</span></td>
<td style="text-align: center;"><span class="red b">4</span></td>
<td style="text-align: center;"><span class="red b">5</span></td>
<td style="text-align: center;"><span class="red b">6</span></td>
</tr>
<tr>
<td style="text-align: center;"><span class="blue b">1</span></td>
<td style="text-align: center;">\(\color{magenta}{\fbox{1}}\)</td>
<td style="text-align: center;">\(\color{magenta}{\fbox{2}}\)</td>
<td style="text-align: center;">\(\color{magenta}{\fbox{3}}\)</td>
<td style="text-align: center;">4</td>
<td style="text-align: center;">\(\color{magenta}{\fbox{5}}\)</td>
<td style="text-align: center;">6</td>
</tr>
<tr>
<td style="text-align: center;"><span class="blue b">2</span></td>
<td style="text-align: center;">\(\color{magenta}{\fbox{2}}\)</td>
<td style="text-align: center;">4</td>
<td style="text-align: center;">6</td>
<td style="text-align: center;">8</td>
<td style="text-align: center;">10</td>
<td style="text-align: center;">12</td>
</tr>
<tr>
<td style="text-align: center;"><span class="blue b">3</span></td>
<td style="text-align: center;">\(\color{magenta}{\fbox{3}}\)</td>
<td style="text-align: center;">6</td>
<td style="text-align: center;">9</td>
<td style="text-align: center;">12</td>
<td style="text-align: center;">15</td>
<td style="text-align: center;">18</td>
</tr>
<tr>
<td style="text-align: center;"><span class="blue b">4</span></td>
<td style="text-align: center;">4</td>
<td style="text-align: center;">8</td>
<td style="text-align: center;">12</td>
<td style="text-align: center;">16</td>
<td style="text-align: center;">20</td>
<td style="text-align: center;">24</td>
</tr>
<tr>
<td style="text-align: center;"><span class="blue b">5</span></td>
<td style="text-align: center;">\(\color{magenta}{\fbox{5}}\)</td>
<td style="text-align: center;">10</td>
<td style="text-align: center;">15</td>
<td style="text-align: center;">20</td>
<td style="text-align: center;">25</td>
<td style="text-align: center;">30</td>
</tr>
<tr>
<td style="text-align: center;"><span class="blue b">6</span></td>
<td style="text-align: center;">6</td>
<td style="text-align: center;">12</td>
<td style="text-align: center;">18</td>
<td style="text-align: center;">24</td>
<td style="text-align: center;">30</td>
<td style="text-align: center;">36</td>
</tbody>
</table>
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<p>é«ãã¯BDã§ãããã®é·ãã¯ç«æ¹ä½ã®1辺ã¨åãã§6cmã§ãã</p>
<p>åºé¢ç©ã®åºãæ¹ã¯æ£æ¹å½¢ACFEã®1辺ã\(3\sqrt{2}\)ã ãã<br />
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ã\(\displaystyle \frac{1}{2}\times 36=18\,\mathrm{cm^2}\)<br />
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<p>ã\(\displaystyle \frac{1}{3}\times 18\times 3\times 2=\underline{36\,\mathrm{cm^3}}\)</p>
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