That’s three-sided shapes with internal angles that total 180 degrees. Isosceles, scalene, equilateral and right-angled. See you later. Urgh, uh hello. It’s the irregular polygons. This bunch ...

A pentagon contains 3 triangles. The sum of the interior ... exterior angle of a polygon = 360 ÷ number of sides.

A polygon is a 2D shape with straight sides that meet at vertices. Polygons have three or more sides. A circle is not a polygon because it doesn’t have straight sides. Polygons can be regular or ...