A cylinder has a base radius of 5 cm and a height of 15 cm, what is its volume in cm**3.
一个圆柱的底面半径是5cm，高是15cm，它的体积是多少cm**3．
<gadget id="calculator">5 ** 2</gadget>
<output>25</output>

<gadget id="calculator">3.14 * 25 * 15</gadget>
<output>1_177.5</output>

<result>1_177.5</result>