The area of the base of a cylinder is 50 square decimeters. The height is 90 decimeters, what is the volume of this cylinder.
一个圆柱的底面积是50平方分米．高是90分米，这个圆柱的体积是多少．
<gadget id="calculator">50 * 90</gadget>
<output>4_500</output>

<result>4_500</result>