The lateral expansion figure of a cylinder is a square, the base radius of the cylinder is known to be 25 centimeters, and what is its height in centimeters.
一个圆柱的侧面展开图形是个正方形，已知圆柱的底面半径是25厘米，它的高是多少厘米．
<gadget id="calculator">2 * 3.14 * 25</gadget>
<output>157</output>

<result>157</result>