If a cylindrical tree with a base radius of 10 cm is sawn into two pieces, how much will the surface area increase in cm**2.
把一根底面半径是10cm的圆柱形树木锯成两段，表面积会增加多少cm**2．
<gadget id="calculator">10 ** 2</gadget>
<output>100</output>

<gadget id="calculator">3.14 * 100 * 2</gadget>
<output>628</output>

<result>628</result>