cone has a volume of 31.4 cubic centimeters and a height of 2.5 centimeters. What is the area of its base?
一个圆锥体积是31.4立方厘米，高是2.5厘米，它的底面积是多少．
<gadget id="calculator">3 / 2.5</gadget>
<output>1.2</output>

<gadget id="calculator">31.4 * 1.2</gadget>
<output>37.68</output>

<result>37.68</result>