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The sine rule

b. a. =. sin B. sin A. l. l. b. a. The sine rule. C. Draw a triangle similar to this one and label the corners A, B and C. If we divide the triangle with a perpendicular line l from C to AB we create two right-angled triangles; AZC and BCZ. b. a. l.

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The sine rule

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  1. b a = sin B sin A l l b a The sine rule C Draw a triangle similar to this one and label the corners A, B and C. If we divide the triangle with a perpendicular line l from C to AB we create two right-angled triangles; AZC and BCZ. b a l From the sine ‘ratio’ we know that: A B Z sin A = and sin B = and l= a sin B So l = b sin A Hence b sin A = a sin B Rearranging  More resources available from: free-online-calculator.net

  2. More resources available from: free-online-calculator.net

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