A cylinder with a height of 5 cm is cut into two upper half cylinders along the height from the diameter. The surface area of the two half cylinders is increased by 80 square centimeters compared with the original one. Find the surface area of the original cylinder.
把一个高为5厘米的圆柱从直径处沿高剖成两上半圆柱，这两个半圆柱的表面积比原来增加80平方厘米，求原来圆柱的表面积．
<gadget id="calculator">80 / 2 / 5</gadget>
<output>8</output>

<gadget id="calculator">8 / 2</gadget>
<output>4</output>

<gadget id="calculator">4 ** 2</gadget>
<output>16</output>

<gadget id="calculator">3.14 * 16 * 2</gadget>
<output>100.48</output>

<gadget id="calculator">3.14 * 8 * 5</gadget>
<output>125.6</output>

<gadget id="calculator">100.48 + 125.6</gadget>
<output>226.08</output>

<result>226.08</result>