If the radius of the base of a cylinder is 5 decimeters and the height is 2 decimeters, what is its lateral area?
一个圆柱底面半径是5分米，高是2分米，它的侧面积是多少平方分米．
<gadget id="calculator">3.14 * 5 * 2 * 2</gadget>
<output>62.8</output>

<result>62.8</result>