Prove that one interior angle of a a regular octagon = 135 degrees
Regular octagon has 6 triangles within it.
Total of interior angles in a triangle = 180 degrees
So the total of interior angles within a regular octagon would = 180 x 6 (=1080).
All angles in a regular octagon are equal 1080/8 = 135
AK
Related Maths GCSE answers
All answers ▸Convert 0.2m^2 to mm^2
Solve the quadratic equation x^2 + 3x + 2 = 0, by factorisation.
Find the length of X and Y of these two right angled triangles (pictured) and prove their congruence, stating the rule.
Solve the simultaneous equations: 3x + y =11; 2x + y = 8