If the diameter of the circle is increased by 5 times, the area of the circle will be increased by how many times the original area.
把圆的直径扩大到原来的5倍，则圆的面积扩大到原来的多少倍．
<gadget id="calculator">5 ** 2</gadget>
<output>25</output>

<result>25</result>