If a cylindrical stick with a base radius of 3 cm and a height of 2 decimeters is cut into two pieces, the surface area is increased by how many square centimeters.
把一个底面半径是3厘米，高是2分米的圆柱形木棍截成两段，表面积增加了多少平方厘米．
<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>