A cylinder is surrounded by a rectangle with a length of 15 cm and a width of 10 cm. What is the maximum area of the cylinder in square centimeters?
用一张长15厘米，宽10厘米的长方形围成一个圆柱，这个圆柱的侧面积最多是多少平方厘米．
<gadget id="calculator">15 * 10</gadget>
<output>150</output>

<result>150</result>