2. Find the sum of interior angles of a polygon of given number of sides by using
formula (n-2) x 180°.
(3) 22 sides
(2) 9 sides
(1)12 sides
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Answer:
sum of angles = (n – 2)180°
Substitute 3 for n. We find that the sum is 180 degrees. This is an important fact to remember.
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