A cylinder has a base circumference of 12.56 cm and a height of 3 cm. What is its lateral area in square centimetres.
一个圆柱的底面周长是12.56厘米，高3厘米．它的侧面积是多少平方厘米．
<gadget id="calculator">12.56 * 3</gadget>
<output>37.68</output>

<result>37.68</result>