A cylinder with a lateral area of 5 decimeters and a base radius of 3 decimeters, what is its volume?
一个的圆柱体侧面积为5平方分米，底面半径是3分米，它的体积是多少平方分米．
<gadget id="calculator">1 / 2</gadget>
<output>1/2 = around 0.5</output>

<gadget id="calculator">5 * (1/2) * 3</gadget>
<output>15/2 = around 7.5</output>

<result>15/2 = around 7.5</result>