What is the area of a circle with a radius of 10 cm in square centimeters?
半径是10厘米的圆的面积是多少平方厘米．
<gadget id="calculator">10 ** 2</gadget>
<output>100</output>

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

<result>314</result>