If a steel bar with a length of 5 meters and a base radius of 3 cm is cut into 4 sections, the surface area will be increased by how many square centimeters.
把一根长5米，底面半径3厘米的钢条截成4段，表面积将增加多少平方厘米．
<gadget id="calculator">3 ** 2</gadget>
<output>9</output>

<gadget id="calculator">3.14 * 9 * 6</gadget>
<output>169.56</output>

<result>169.56</result>