7) Given triangle ABC alongside: a) Determine an expression for Angle A in terms of B and C. b) Hence, prove that cos A = sin B sin C - cos B cos C. В. C​

a=sin is the answer of that question

circle area = pi * radius^2

if diameter = 10 then radius = 5

circle area = pi * 5^2

circle area = pi * 25

circle area = 78.5398163397 square units

step-by-step explanation:

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step-by-step explanation:

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