A square is obtained by unfolding the sides of a cylinder. The radius of the base of the cylinder is 10 cm. What is the height of the cylinder in cm?
把一个圆柱侧面展开得到一个正方形，这个圆柱的底面半径是10厘米，那么圆柱的高是多少厘米．
<gadget id="calculator">3.14 * 2 * 10</gadget>
<output>62.8</output>

<result>62.8</result>