cylinder and a cone have the same volume and height, if the base area of the cylinder is 30 cm, what is the area of the base of the cone in square centimeters
一个圆柱与圆锥的体积相等，高也相等，若圆柱的底面积是30厘米，则圆锥的底面积为多少平方厘米
<result>90</result>