A cylinder has a base radius of 3 cm and a height of 10 cm. If the cylinder is cut into two smaller cylinders, how many square centimeters will the surface area increase?
一个圆柱的底面半径是3厘米，高是10厘米．如果把这个圆柱截成两个小圆柱，表面积增加多少平方厘米．
<gadget id="calculator">3 ** 2</gadget>
<output>9</output>

<gadget id="calculator">3.14 * 9 * 2</gadget>
<output>56.52</output>

<result>56.52</result>