1. ©G Dear2008 – Not to be sold/Free to use
Mathematic
(Preliminary)
Trigonometry
Trigonometric
Ratios
Stage 6 - Year 11
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©G Dear2008 – Not to be sold/Free to use

2. Trigonometric Ratios Opposite Sin φ = Hypotenuse Adjacent Cos φ =θ
Adjacent
Opposite O A
Opposite
Hypotenuse
Sin φ =
Adjacent
Hypotenuse
Cos φ =
Adjacent
Hypotenuse
Tan φ =

3. Trigonometric Ratios - Example
H = φ 13
O =
A = 5 θ
O =
A = 12 5 13 O H 12 13
Sin θ = O H
Sin φ = 12 13 A H 5 13
Cos θ =
Cos φ = A H 5 12 A 12 5 A
Tan θ =
Tan φ =