A cylinder and a cone have the same volume and height; the area of the base of the cylinder is 15cm**2; the area of the base of the cone is how many square centimeters.
一个圆柱和一个圆锥体积相等，高也相等；圆柱的底面积是15cm**2；圆锥的底面积是多少平方厘米．
<gadget id="calculator">15 * 3</gadget>
<output>45</output>

<result>45</result>