Calculating angles using trigonometric ratios - Tutorial

math tutorials > calculating angles using trig ratios

 

The size of an unknown angle in a right-angled triangle can be calculated using the trigonometric ratios. 

 

You will need to use the INV / Shift / 2ndf key on your scientific calculator.

 

Steps

1. Label the sides.
2. Identify which trig. ratio uses these sides.
3. Calculate the angle.

e.g.

 

 

For you to try.