90
If it is a regular 8 sided octagon then each exterior angle is 45 degrees and each interior angle is 135 degrees.
Four inside angles, all of them being right angles (90 degrees) in each corner. You could also count the four outside angles, outside each corner, each one being 270 degrees. (Adding one inside angle with its outside angle = 360 degrees (a circle)
360/45 = 8 so the polygon has 8 sides.
Each exterior angle = 630/6 = 60 degrees. So each interior angle = 180 - 60 = 120 degrees.
Each angle of a rectangle measures 90 degrees.
A right angle - whether or not in a rectangle - is 90 degrees.
90
Normally 4 sides as in a square or a rectangle
90 degrees inside each of the four corners. Total is 360 degrees, as you might expect. "Rect" means "right"; so rectangle means right angle, which means 90 degrees.
A rectangle has 4 equal right angles of 90 degrees.
A rectangle has four corners, each of which is 90 degrees. 4 * 90 degrees = 360 degrees
If it is a regular 8 sided octagon then each exterior angle is 45 degrees and each interior angle is 135 degrees.
Each angle for a regular nonagon is 140 degrees each.
Four inside angles, all of them being right angles (90 degrees) in each corner. You could also count the four outside angles, outside each corner, each one being 270 degrees. (Adding one inside angle with its outside angle = 360 degrees (a circle)
360 degrees--90 for each corner
360/45 = 8 so the polygon has 8 sides.