If a cylinder has a base radius of 4 decimeters and a height of 3 decimeters, what is the lateral area in square decimeters?
一个圆柱体的底面半径是4分米，高3分米，侧面积是多少平方分米．
<gadget id="calculator">3.14 * 4 * 2 * 3</gadget>
<output>75.36</output>

<result>75.36</result>