A cylindrical piece of wood is 4m long and has a base radius of 10cm. After cutting it into 3 sections, how much does the surface area increase in cm**2.
一个圆柱形木头长4m，底面半径是10cm，把它截成3段后，表面积增加了多少cm**2．
<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>