If a cylindrical piece of wood with a length of 3.2 meters and a cross-sectional diameter of 30 centimeters is cut into 4 equal sections, how many square centimeters will the surface area increase?
把一根长3.2米的圆柱形木料，横截面直径是30厘米，把它截成相等的4段，表面积增加多少平方厘米．
<gadget id="calculator">30 / 2</gadget>
<output>15</output>

<gadget id="calculator">15 ** 2</gadget>
<output>225</output>

<gadget id="calculator">3.14 * 225 * 6</gadget>
<output>4_239</output>

<result>4_239</result>