Question

If A, B, C are adjacent angles and triangle ABC then show that ( B + C / 2) = Cas A/ 2

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Answer 1

Answer:

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Answer 2

Step-by-step explanation:

We know that the sum of angles of a triangle = 180.

• A + B = 180
• B + C = 180
• B +C = 180-A
• B +C/2= 180-A/2
• B +C = 90-A/2
• sin (B+C /2) = sin (90 - A/2)
• sin (B+C)= cos A/2

Hence, sin (B+C )= cos A/2

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