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Solve the triangle ABC if a = 5, b = 4 and C = 68°.

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Solve the triangle ABC if a = 5, b = 4 and C = 68°.

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To find c, use c2 = a2 + b2 – 2ab cos C 

c2 = 25 + 16 – 2 × 5 × 4 cos 68° 

= 41 – 40 × 0.3746 = 26.016 

c = 5.1

To find the other two angles, use sine formula.

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