The diameter of the base of the cylinder is 4 cm, and the volume is 50.24 cm. Find its height.
圆柱的底面直径4厘米，体积50.24厘米，求它的高．
<gadget id="calculator">4 / 2</gadget>
<output>2</output>

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

<gadget id="calculator">3.14 * 4</gadget>
<output>12.56</output>

<gadget id="calculator">50.24 / 12.56</gadget>
<output>4</output>

<result>4</result>