A piece of cylindrical steel is 2 meters long. Cut it into two sections along its cross section, and its surface area increases by 62.8 square centimeters. If this section of steel is melted and cast into a cone with a radius of 20 centimeters, then the height of the cone is How many centimeters (π takes 3.14)
一段圆柱体钢材长2米，沿它的横截面把它截成两节，表面积比原来增加了62.8平方厘米，如果把这段钢材熔铸成底面半径是20厘米的圆锥，那么，这个圆锥的高是多少厘米(π取3.14)
<gadget id="calculator">3.14 * 20 * 20</gadget>
<output>1_256</output>

<gadget id="calculator">3 / 1_256</gadget>
<output>3/1_256 = around 0.002389</output>

<gadget id="calculator">31.4 * 2 * 100 * (3/1_256) * 10</gadget>
<output>150</output>

<result>150</result>