1 Press Ctrl-A ©G Dear2008 – Not to be sold/Free to use Cosine Ratio Stage 4 Year 9.

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Presentation transcript:

1 Press Ctrl-A ©G Dear2008 – Not to be sold/Free to use Cosine Ratio Stage 4 Year 9

2 Hypotenuse Adjacent Adjacent Click Cos θ = AdjacentHypotenuse θ θ Trig Ratios

Cos θ = AdjacentHypotenuseP QR 5 Cos P = 5 13 Cos R = Trig Ratios

4 26 Cos θ = AdjacentHypotenuseP Q R 10 Cos A = A B 5 C Cos P = = 5 13 22222222 Cos C = Cos R = = 22222222 24 Trig Ratios

o Cos θ = AdjacentHypotenusem cos 60 o = m 6 6x x6 m = 6 x cos 60 o = 3 Use your Calculator! Trig Ratios

o d cos 30 o = d 10 10x x10 10 x cos 30 o ≈ 8.66 Use your Calculator! d = Trig Ratios Cos θ = AdjacentHypotenuse

7 k 50 o 6 cos 50 o = 6 k kx xk 6 = k x cos 50 o ≈ 9.33 Use your Calculator!  Sin 50 o  Sin 50 o k = 6  cos 50 o Trig Ratios Cos θ = AdjacentHypotenuse

8 12 zozozozo 6 cos z o = 6 12 zo =zo =zo =zo = cos -1 ( ) Use your Calculator! = 60 o 612 Trig Ratios Cos θ = AdjacentHypotenuse

9 15 momomomo 5 cos m o = 5 15 mo =mo =mo =mo = cos -1 ( ) Use your Calculator! ≈ 71 o 515 To nearest whole degree Trig Ratios Cos θ = AdjacentHypotenuse

10 S Some O Old H Hags C Can A Always H Hide T Their O Old A Age S Sin O Opposite H Hypotenuse C Cos A Adjacent H Hypotenuse T Tan O Opposite A Adjacent