If a log with a length of 90 cm and a base radius of 4 cm is sawn into four pieces on average, how many square centimeters can the surface area be increased in total?
把一根长90厘米，底面半径为4厘米的圆木平均锯成四段，表面积一共可以增加多少平方厘米．
<gadget id="calculator">4 ** 2</gadget>
<output>16</output>

<gadget id="calculator">3.14 * 16 * 6</gadget>
<output>301.44</output>

<result>301.44</result>