The perimeter of a cylindrical wood is 12.56 meters and the height is 4 meters. If it is cut into three sections, how much will the surface area increase?
一根圆柱形木料底面周长是12.56米，高4米，如果把它截成三段，表面积增加多少㎡．
<gadget id="calculator">12.56 / 3.14 / 2</gadget>
<output>2</output>

<gadget id="calculator">2 ** 2</gadget>
<output>4</output>

<gadget id="calculator">3.14 * 4 * 4</gadget>
<output>50.24</output>

<result>50.24</result>