A cylinder is expanded to form a square. The radius of the base of the cylinder is 10 cm. What is the height of the cylinder in decimeters?
把一个圆柱侧面展开是一个正方形，这个圆柱的底面半径是10厘米，圆柱的高是多少分米
<gadget id="calculator">3.14 * 10 * 2</gadget>
<output>62.8</output>

<gadget id="calculator">62.8 / 10</gadget>
<output>6.28</output>

<result>6.28</result>