A cylindrical teacup without a lid has a base diameter of 8 cm and a height of 10 cm. What is its volume.
一个圆柱形无盖茶杯，底面直径是8厘米，高是10厘米．它的容积是多少．
<gadget id="calculator">8 / 2</gadget>
<output>4</output>

<gadget id="calculator">4 ** 2</gadget>
<output>16</output>

<gadget id="calculator">3.14 * 16 * 10</gadget>
<output>502.4</output>

<result>502.4</result>