How much does the surface area increase when a piece of cylindrical wood with a length of 1 meter and a cross-sectional diameter of 6 decimeters is cut into two identical cylinders?
把一根长1米，横截面直径为6分米的圆柱形木材，截成两个相同的圆柱后，表面积增加了多少
<gadget id="calculator">6 / 2</gadget>
<output>3</output>

<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>