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Formula: sum of interior angles = (n-2) x 180 where: n=number of sides = (8-2) x 180 =6 x 180 =1080 degrees
The 8 interior angles of an octagon add up to 1080 degrees
That is a regular octogan (8 sided shape)
The 8 interior angles of an 8 sided octagon add up to 1080 degrees
The sum of inner degrees of a triangle is 180 degrees.