The surface area of a cylinder is 3140 square centimeters, the base radius of this cylinder is high (1/4), what is the lateral area of this cylinder?
一个圆柱的表面积是3140平方厘米，这个圆柱的底面半径是高的(1/4)，这个圆柱的侧面积是多少？
<gadget id="calculator">1 / 4</gadget>
<output>1/4 = around 0.25</output>

<gadget id="calculator">40 * (1/4)</gadget>
<output>10</output>

<gadget id="calculator">3.14 * 2 * 10 * 40</gadget>
<output>2_512</output>

<result>2_512</result>