If a cylindrical piece of wood with a length of 3 meters and a base radius of 5 cm is sawn in half along the diameter, the surface area will be increased by how many square centimeters.
把一根长3米，底面半径为5厘米的圆柱形木料沿直径锯成两半，表面积增加多少平方厘米．
<gadget id="calculator">3 * 100</gadget>
<output>300</output>

<gadget id="calculator">2 * 5 * 300 * 2</gadget>
<output>6_000</output>

<result>6_000</result>