If a cylinder with a base radius of 5 cm is sawed into two identical cylinders, the surface area will increase by how many square centimetres.
把一个底面半径为5厘米的圆柱体，锯成两个相同的圆柱体，表面积增加多少平方厘米．
<gadget id="calculator">5 ** 2</gadget>
<output>25</output>

<gadget id="calculator">3.14 * 25 * 2</gadget>
<output>157</output>

<result>157</result>