How much does the surface area increase when a cylindrical stick with a radius of 2 cm is sawed into 4 smaller sticks?
将一根半径为2厘米的圆柱形木棒锯成4段小木棒后，表面积增加多少．
<gadget id="calculator">2 ** 2</gadget>
<output>4</output>

<gadget id="calculator">3.14 * 4 * 6</gadget>
<output>75.36</output>

<result>75.36</result>