If a cylinder is cut into two small cylinders, its surface area will increase by 12.56 square centimeters; if two half cylinders are split along the diameter, the surface area will increase by 100 square centimeters. Find the surface area of the original cylinder.
一个圆柱体，如截成两个小圆柱体，它的表面积增加12.56平方厘米；如沿着直径劈开两个半圆柱体，表面积增加了100平方厘米，求原来圆柱体的表面积．
<gadget id="calculator">100 / 2 / 2</gadget>
<output>25</output>

<gadget id="calculator">6.28 * 25</gadget>
<output>157</output>

<gadget id="calculator">12.56 + 157</gadget>
<output>169.56</output>

<result>169.56</result>