### Possible Answer

Best Answer: use the formulas angle sum = (number of sides - 2)X180 degrees for an octagon n = 8 angle sum = (8 -2 )x180 =(6x180) = 1080 since the octagon is regular (all sides and interior angles equal) interior angle =angle sum of the polygon / number of sides = 1080/8 = 135 degrees ... - read more

The measure of the entire interior of a regular decagon is 1440 degrees. 1440 divided by 10 equals 135 degrees. Therefore, 135 degrees is your final answer. - read more

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