A cylindrical steel with a length of 4 meters and a diameter of 4 cm at the bottom is sawed into 3 sections of the same length. How many square centimeters is the surface area increased compared to the original?
一根长4米，底面直径4厘米的圆柱形钢材，把它锯成同样长的3段，表面积比原来增加了多少平方厘米？
<gadget id="calculator">4 / 2</gadget>
<output>2</output>

<gadget id="calculator">2 ** 2</gadget>
<output>4</output>

<gadget id="calculator">3.14 * 4 * 4</gadget>
<output>50.24</output>

<result>50.24</result>