There is a round steel with a cross-sectional diameter of 20 cm. After it is cut into two sections, the sum of the surface areas of the two sections is 7536 square centimeters. What is the volume of the original round steel?
有一根横截面直径为20厘米的圆钢，截成两段后，两段表面积的和为7536平方厘米，原来那根圆钢的体积是多少？
<gadget id="calculator">20 / 2</gadget>
<output>10</output>

<gadget id="calculator">10 ** 2</gadget>
<output>100</output>

<gadget id="calculator">3.14 * 100 * 4</gadget>
<output>1_256</output>

<gadget id="calculator">7_536 - 1_256</gadget>
<output>6_280</output>

<gadget id="calculator">6_280 / 3.14 / 20</gadget>
<output>100</output>

<gadget id="calculator">3.14 * 100 * 100</gadget>
<output>31_400</output>

<result>31_400</result>