A cylinder and a cone with equal height and volume respectively, the base area of the cylinder is known to be 15cm**2, what is the base area of the cone in cm**2.
高和体积分别相等的圆柱和圆锥，已知圆柱的底面积是15cm**2，圆锥的底面积是多少cm**2．
<gadget id="calculator">15 * 3</gadget>
<output>45</output>

<result>45</result>