The circumference of the bottom of a cylinder is 12.56cm and the height is 4cm. What is the lateral area of the cylinder in square centimeters?
一个圆柱底面周长是12.56cm，高是4cm，圆柱体的侧面积是多少平方厘米．
<gadget id="calculator">12.56 * 4</gadget>
<output>50.24</output>

<result>50.24</result>