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The Sine Law How to use sine law to find the angles and lengths of triangles.

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Presentation on theme: "The Sine Law How to use sine law to find the angles and lengths of triangles."— Presentation transcript:

1 The Sine Law How to use sine law to find the angles and lengths of triangles.

2 ab A c B C = Sin ASin B ab The basics of Sine Law

3 5.9m (a) 7.8m (b) c B C A = Sin ASin B ab = Sin 36˚Sin B ˚ =SinB x 5.9(Sin36˚)(7.8) =SinB(Sin36˚)(7.8) 5.9 =

4 =

5 EX 2 θ θ E C B A 15.6m 36.0m = Sin BSin C bc = Sin θSin140˚ Θ= sinˉ¹ (15.6)(sin140˚) 36.0 N Θ=16˚

6 Try this one out 115˚ 16m 49m A C B C

7 = Sin ASin115˚ 1649 A= Sinˉ¹ (sin115˚)(16) 49 A= 31˚ C=180-(31+115) C= C=34˚ = Sin ASin C ac = Sin31˚Sin34˚ 16c = Sin31˚ 16 cSin34˚ x = c


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