A cylinder with a height of 8 cm is cut into two identical parts along the diameter of the base, and the surface area is increased by 320 cm2. What is the surface area of the original cylinder?
一个高为8厘米的圆柱体，沿底面直径切成完全相同的两部分，表面积增加了320平方厘米．原来圆柱体的表面积是多少？
<gadget id="calculator">320 / 2 / 8</gadget>
<output>20</output>

<gadget id="calculator">3.14 * 20 * 8</gadget>
<output>502.4</output>

<gadget id="calculator">20 / 2</gadget>
<output>10</output>

<gadget id="calculator">10 ** 2</gadget>
<output>100</output>

<gadget id="calculator">3.14 * 100 * 2</gadget>
<output>628</output>

<gadget id="calculator">502.4 + 628</gadget>
<output>1_130.4</output>

<result>1_130.4</result>