If a cylindrical piece of wood with a length of 5 decimeters and a base radius of 2 decimeters is cut into 4 sections of the same length, the surface area will be increased by how many square centimeters.
把一根长5分米，底面半径2分米的圆柱形木材截成同样长的4段，表面积将增加多少平方厘米．
<gadget id="calculator">2 ** 2</gadget>
<output>4</output>

<gadget id="calculator">4 - 1</gadget>
<output>3</output>

<gadget id="calculator">3 * 2</gadget>
<output>6</output>

<gadget id="calculator">3.14 * 4 * 6 * 100</gadget>
<output>7_536</output>

<result>7_536</result>