We’ve done some really good maths investigation work this week finding out about angles in polygons using what we know about the angles in a triangle. We have discovered an interesting pattern that the number of triangles in a polygon is 2 less than its number of sides. We used this to find the sum of the angles in the polygon (e.g. a hexagon has 6 sides and 4 (= 6-2) triangles, so the sum of its angles is 4 x 180 degrees (= 720 degrees). If we had a regular hexagon, all six angles would be equal, so we could work out that they must be 720 divided by 6 = 120 degrees.
We enjoyed looking at the interactive polygon site and checking our ideas about angles in polygons. If you want to look at it, you will find it here.
Hi I’ve just been on the angles in polygons and I’ve got all the way up to 101 in the angles so it looks like a very detailed circle