The perimeter of a conical sand pile is 12.56 meters and the height is 5 meters. What is the area of the sand pile?
一个圆锥形沙堆的底面周长是12.56米，高是5米，这个沙堆的占地面积是多少？
<gadget id="calculator">2 * 3.14</gadget>
<output>6.28</output>

<gadget id="calculator">12.56 / 6.28</gadget>
<output>2</output>

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

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

<result>12.56</result>