Right so to find the interior angles of a shape you need to find the number of sides in a shape and minus 2 You then times this number by 180 to get the sum of interior angles for that shape Let’s start with the octagon It has 8 sides so you need to do 6*180 which gives you 1080 You divide this by 8 which gives you 135 This is one angle in the octagon If you do this for all of the shapes you get 135, 108 and 120 degrees If you add these all up you get 363 which is 3 degrees off of 360 which would be a perfect fit
