If a log with a length of 90 cm and a base radius of 4 cm is sawn into three equal parts, how much square centimeters can the total surface area be increased?
把一根长为90厘米，底面半径为4厘米的圆木平均锯成三段，表面积一共可增加多少平方厘米．
<gadget id="calculator">4 ** 2</gadget>
<output>16</output>

<gadget id="calculator">3.14 * 16 * 4</gadget>
<output>200.96</output>

<result>200.96</result>