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TOA

The three trigonometric ratios for right angled triangles are considered here. Click on a box to select a ratio. SOH. CAH. TOA. 1. sin . . Back to menu. SOH. On the unit circle sin  is observed. 1. sin . Now take a similar triangle. SOH. . Hyp. 1. Opp. sin . =.

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TOA

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

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

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

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

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

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

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

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

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

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

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