Unfold the sides of a cylinder to obtain a square. Given that the height of this cylinder is 10 cm, what is its lateral area in square centimeters?
把一个圆柱的侧面展开，得到一个正方形．已知这个圆柱的高是10厘米，它的侧面积是多少平方厘米．
<gadget id="calculator">10 * 10</gadget>
<output>100</output>

<result>100</result>