Cutting a cylinder with a height of 20 cm into an approximate cuboid increases the surface area by 160 cm2. What is the area of the original cylinder in square centimeters?
把一个高20厘米的圆柱切拼成一个近似的长方体，表面积增加160平方厘米．原来圆柱体的面积是多少平方厘米？
<gadget id="calculator">100.48 + 502.4</gadget>
<output>602.88</output>

<result>602.88</result>