18 gon is 18 sided figure. Internal angles of 18 sided figure is (2 x 18 - 4) right angles = 32 x 90 Find_the_measure_of_one_interior_angle_of_a_regular_decagon, hence one angle is (32 x 90)/18 = 32 x 5 = 160 degrees
Find_the_measure_of_one_interior_angle_of_a_regular_decagon
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Each interior angle is 140 degrees. Each exterior angle is 220 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 is 60 degrees. (180/3)
Each interior angle of an octagon has an angle of 135 degrees.
Each exterior angle = 630/6 = 60 degrees. So each interior angle = 180 - 60 = 120 degrees.