The side view of a cylinder is a square. Given that the circumference of the base of this cylinder is 6 cm, what is its lateral area?
一个圆柱的侧面展开图是一个正方形．已知这个圆柱的底面周长是6厘米，它的侧面积是多少．
<gadget id="calculator">6 * 6</gadget>
<output>36</output>

<result>36</result>