How do I find the perimeter of a regular polygon with one side being 5-2x and another being -4x+9?
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Since a regular polygon has congruent sides (every side is equal to each other) you set up the equation 5-2x = -4x+9 then you solve for "x". After solving for "x", you substitute the answer you got from "x" back into the one of the expressions from one of the sides. You should get the answer of how many units one of the sides is. After that, just multiply that answer by how many sides the polygon has to get your perimeter.
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