If a cylindrical piece of wood with a base radius of 10 cm is sawn into 2 pieces, what is the increase in surface area in square centimetres?
把一根底面半径是10厘米的圆柱形木材锯成2段，表面积增加多少平方厘米．
<gadget id="calculator">10 ** 2</gadget>
<output>100</output>

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

<result>628</result>