What is the volume of a cylinder whose base circumference is 28.26 cm and height is 10 cm?
一个圆柱，底面周长是28.26厘米，高是10厘米，它的体积是多少．
<gadget id="calculator">28.26 / 3.14 / 2</gadget>
<output>4.5</output>

<gadget id="calculator">4.5 ** 2</gadget>
<output>20.25</output>

<gadget id="calculator">3.14 * 20.25 * 10</gadget>
<output>635.85</output>

<result>635.85</result>