Right angled triangles have
- one angle that measures 90 degrees;
- a side called the hypotenuse which lies opposite the 90 degree angle;
- two smaller angles that add together to 90 degrees
In a problem involving only the sides of the right angled triangle, we use Pythagoras’ Theorem to solve it.
In a problem involving an angle, we use trigonometry (the SOH CAH TOA formulae) to solve it.