As shown in the figure below, the surface area of a cylinder is reduced by 31.4 square centimeters after a 5 cm long section of the cylinder is cut off

The conditions of the title are not complete, so I can only count them here
2*r*3.14=31.4.r=1
S total = 2S bottom + s side
=2*(1^2)*3.14+2*1*3.14*h
=28 + 6. 28h. (H is the height of the original cylinder)

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