cylinder has a base diameter of 10 cm and a height of 4 cm, what is its lateral area in square centimeters?
一个圆柱的底面直径是10厘米，高是4厘米，它的侧面积是多少平方厘米．
<gadget id="calculator">3.14 * 10 * 4</gadget>
<output>125.6</output>

<result>125.6</result>