What is the sum of the measures of the interior angles of an octagon?
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Number of sides of an octagon = 8
=8-2
=6.
6*180°= 1080°
1080°÷8 = 135°
Therefore the sum of the measures of the interior angles of an octagon is 135°.
The method is simple.
Subtract two from the number of sides in an octagon. Since an octagon has eight sides, subtract two from eight to get six. Multiply six by 180 to find the total number of degrees in an octagon equals 1,080. Divide 1,080 by eight to find the measure of each interior angle if the octagon is regular
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