By measure, I will assume you mean what is each interior angle, or what is the sum of the interior angles. The sum is 8,640 degrees, and each interior angle is 172.8 degrees. Side fact: that means there is an exterior angle of only 7.2 degrees. A polygon with 1000 sides would have an exteror angle of only 0.46 degrees. However, and this makes sense, no matter how many sides in the polygon, the interios angle will not add up to 180.
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the measure for a regular rectangle is 69in. by fudge you and measure it yourself.
An interior angle of a regular octagon is 45 degrees. The exterior angles measure 315 degrees.
Regular Polygons
Any measure that you like. The measure can be uniquely determined only if it is a REGULAR hexagon.
The measure of each interior angle of a fifteen sided regular polygon, a pendedecagon, is 156o.