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what is the formula to find angle A? please help

what is the formula to find angle A? please help-example-1

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Answer:

Explanation:

The formula for finding the total measure of all interior angles in a polygon is: (n – 2) x 180. In this case, n is the number of sides the polygon has. Some common polygon total angle measures are as follows: The angles in a triangle (a 3-sided polygon) total 180 degrees.

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