Flag Trigonometry> In any triangle ABC if AB=2AB=2 ,BC=4BC=4,AC=3AC=3 AND D is th
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In any triangle ABC if AB=2AB=2 ,BC=4BC=4,AC=3AC=3 AND D is the midpoint of BC then cos B=?,cosC=?

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Divyanshu , 7 Years ago
Grade 11
anser 1 Answer
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Arun

Last Activity: 7 Years ago

cos B = a2 + c2 –b2/ 2 a*c
similarily cos C = a2 + b2 –c2/ 2 a*b
put the values, you wil get answers
where a = 4, b = 3, c = 2
hence cos B = 11/16
cos C = 21/24
hope it helps

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