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Right Angled Triangles

right angled scalene triangle

A right angled triangle is (you guessed it), a triangle which has a right angle (90°) in it.

right angle symbol The little square in the corner tells us that it is a right angled triangle (I wrote 90°, but you don't need to!)

Two Types

There are two types of right angled triangle:

  • An isosceles right angled triangle
  • A scalene right angled triangle
Isosceles right angled triangle Isosceles right angled triangle

One right angle
Two other equal angles always of 45°
Two equal sides

right angled scalene triangle Scalene right angled triangle

One right angle
Two other unequal angles
No equal sides

 

The 3,4,5 Triangle

The "3,4,5 Triangle" has a right angle in it:

(It is a scalene right angled triangle)

A very useful triangle to draw if you need a right angle!

3,4,5 Triangle