If the radius of a circle is increased by 5 times, how many times does the area increase.
一个圆的半径扩大5倍，面积扩大多少倍．
<gadget id="calculator">10 ** 2</gadget>
<output>100</output>

<gadget id="calculator">3.14 * 100</gadget>
<output>314</output>

<gadget id="calculator">2 ** 2</gadget>
<output>4</output>

<gadget id="calculator">3.14 * 4</gadget>
<output>12.56</output>

<gadget id="calculator">314 / 12.56</gadget>
<output>25</output>

<result>25</result>