If a cylindrical tree with a base radius of 10 cm is sawed into 3 sections, how much will the surface area increase?
把一根底面半径是10cm的圆柱形树木锯成3段，表面积会增加多少．
<gadget id="calculator">10 ** 2</gadget>
<output>100</output>

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

<result>1_256</result>