A cylinder has a base radius of 10 decimeters and a height of 20 decimeters, what is its volume dm**3.
一个圆柱体的底面半径是10分米，高20分米，它的体积是多少dm**3．
<gadget id="calculator">10 ** 2</gadget>
<output>100</output>

<gadget id="calculator">3.14 * 100 * 20</gadget>
<output>6_280</output>

<result>6_280</result>