If a round steel with a length of 3 meters and a diameter of 3 cm at the bottom is cut into two cylinders, the surface area will be increased by how many square centimeters compared to the original one.
把一根长3米、底面直径3厘米的圆钢切成2根圆柱体，表面积比原来增加多少平方厘米．
<gadget id="calculator">3 / 2</gadget>
<output>3/2 = around 1.5</output>

<gadget id="calculator">(3/2) ** 2</gadget>
<output>9/4 = around 2.25</output>

<gadget id="calculator">3.14 * (9/4) * 2</gadget>
<output>14.13</output>

<result>14.13</result>