If the circumference of the base of a cylinder is 27 cm and the height is 4 decimeters, what is the lateral area?
一个圆柱的底面周长是27厘米，高是4分米，侧面积是多少．
<gadget id="calculator">4 * 10</gadget>
<output>40</output>

<gadget id="calculator">27 * 40</gadget>
<output>1_080</output>

<result>1_080</result>