cylinder with a length of 12 cm is cut to a thickness of 5 cm, and the surface area of the cylinder is reduced by 31.4 cm2. What is the surface area of the original cylinder in cm2?
一个长12厘米的圆柱体被截取5厘米厚，圆柱的表面积减少了31.4平方厘米，求原来圆柱体的表面积是多少平方厘米？
<gadget id="calculator">31.4 / 5 / 3.14 / 2</gadget>
<output>1</output>

<gadget id="calculator">1 ** 2</gadget>
<output>1</output>

<gadget id="calculator">3.14 * 1 * 2 * 12</gadget>
<output>75.36</output>

<gadget id="calculator">3.14 * 1 * 2</gadget>
<output>6.28</output>

<gadget id="calculator">75.36 + 6.28</gadget>
<output>81.64</output>

<result>81.64</result>