You can put this solution on YOUR website! 3 angles of an octagon are x each.if the other angles are 20 more than each of the other 3 find x
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If "x" is the interior angle, 180-x is the exterior angle.
If "x+20" is the interior angle, 160-x is the exterior angle.
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The sum of the exterior angles is 360.
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Equation:
3(180-x)+5(160-x) = 360
540-3x+800-5x = 360
-8x+1340 = 360
-8x = -980
x = 122.5 degrees
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Cheers,
Stan H.
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