Main Lesson
Triangles
There are 4 types of triangle. They all have 3 sides and are polygons.
1. Equilateral
Equilateral triangles have 3 equal sides and 3 equal angles of 60°
2. Isosceles
Isosceles triangles have 2 equal sides and 2 equal angles.
3. Right-angled
1 of the angles is a right angle (90°) in right-angled triangles.
4. Scalene
Scalene triangles have no equal sides and no equal angles.
Trophy challenge
