If a cylinder whose base circumference is 12.56 cm is cut into 3 equal small cylinders, the surface area will be increased by how many square centimeters compared to the original one.
把一个底面周长是12.56厘米的圆柱截成3个相等的小圆柱，表面积比原来增加多少平方厘米．
<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>