It is known that a square iron sheet with an area of several square centimeters is rolled into a cylinder, and the area of the bottom of the cylinder is 100 square centimeters. Find the lateral area of the enclosed cylinder?
已知用一张面积为若干平方厘米的正方形铁皮卷成一个圆柱体，圆柱体底面积为100平方厘米．求围成的圆柱的侧面积？
<gadget id="calculator">400 * 3.14</gadget>
<output>1_256</output>

<result>1_256</result>