A cylinder has a base diameter of 8 cm and a height of 10 cm, what is its lateral area?
一个圆柱的底面直径是8cm，高是10cm，它的侧面积是多少．
<gadget id="calculator">3.14 * 8 * 10</gadget>
<output>251.2</output>

<result>251.2</result>