The central island of the Drum Tower is a circle with a radius of 10 meters. What is its area in square meters?
鼓楼中心岛是半径10米的圆，它的占地面积是多少平方米．
<gadget id="calculator">10 ** 2</gadget>
<output>100</output>

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

<result>314</result>