A cone and a cylinder have the same volume and height. It is known that the circumference of the base of the cylinder is 12.56 decimeters. What is the area of the base of the cone?
一个圆锥和一个圆柱等体积等高，已知圆柱的底面周长是12.56分米，圆锥的底面积是多少？
<gadget id="calculator">12.56 / 3.14 / 2</gadget>
<output>2</output>

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

<gadget id="calculator">3.14 * 4 * 3</gadget>
<output>37.68</output>

<result>37.68</result>