Guess what the equal angles are?

Triangles

A triangle has three sides and three angles

The three angles always add to 180°

Equilateral, Isosceles and Scalene

There are three special names given to triangles that tell how many sides (or angles) are equal.

There can be 3, 2 or no equal sides/angles:


Equilateral Triangle
Three equal sides
Three equal angles, always 60°


Isosceles Triangle
Two equal sides
Two equal angles


Scalene Triangle
No equal sides
No equal angles




What Type of Angle?

Triangles can also have names that tell you what type of angle is inside:

Acute Triangle
All angles are less than 90°


Right Triangle Has a right angle (90°)

Obtuse Triangle Has an angle more than 90°



Combining the Names

Sometimes a triangle will have two names, for example:

Right Isosceles Triangle
Has a right angle (90°), and also two equal angles

Can you guess what the equal angles are?

Maths coordinator