1. SOHCAHTOA TOA CAH SOH The three trigonometric ratios for right angled triangles are considered here. Click on a box to select a ratio.

2. SOHCAHTOA SOH On the unit circle sin  is observed sin  1  Back to menu

3. SOHCAHTOA sin  1  SOH Now take a similar triangle

4. SOHCAHTOA Opp Hyp By similar triangles SOH =  sin  = sin  1 

5. SOHCAHTOA cos  1  CAH On the unit circle cos  is observed Back to menu

6. SOHCAHTOA cos  1  CAH Now take a similar triangle

7. SOHCAHTOA  Adj Hyp By similar triangles CAH =  cos  = cos  1

8. SOHCAHTOA TOA On the unit circle tan  is observed tan  1  1 Back to menu

9. SOHCAHTOA TOA tan   1 Now take a similar triangle

10. SOHCAHTOA By similar triangles TOA  Adj Opp tan  1  tan  = = 