In ABC- if a - 16- b - 24 and c - 20- then cos B-2 - -MP PET 1988-

2s = a + b + c : cos B/2 = √(30 × 6/320) = 3/4. ...

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Trigonometric Ratios of Half Angles

In ABC, if a ...

Question

In $△$ ABC, if a = 16, b = 24 and c = 20, then cos $\frac{B}{2}$ =
[MP PET 1988]

3/4

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△

\frac{B}{2}

Δ A B C

a = 16, b = 24

c = 20

cos \frac{B}{2} =

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[MP PET 1991]

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[MP PET 1991]

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