There is a cylinder with a height of 6cm and a perimeter of the bottom surface of 12.56cm. What is its lateral area in cm**2.
有一个圆柱体高6cm，底面周长是12.56cm，它的侧面积是多少cm**2．
<gadget id="calculator">12.56 * 6</gadget>
<output>75.36</output>

<result>75.36</result>