The radius of the base of a cylinder is 3 decimeters and the height is 8 meters. What is the increase in the surface area after sawing it into 2 sections?
某圆柱底面半径是3分米，高8米，把它锯成2段后表面积增加多少平方分米．
<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>