There is a regular n prism with 22 faces, and the sum of the lengths of all the side edges is 10 cm, and the side length of the bottom area is 5 cm

Because there are 22 sides except the two bottom sides, the side is 22-2 = 20
The sum of the length of all sides is 10 cm, so the length of one side is 10 / 20 = 0.5
The side length of the bottom area is 5cm, so the side area is 0.5 * 5 = 2.5

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