Question

If the magnitudes of the vectors A, B and C are 6, 8, 10 units respectively and if A + B = C, then what is the angle between A and B
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Answer 1

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Answer 2

Answer: A: 6Units

B: 8units

C: 10units

therefore, A+B= C ( to find the angle bw A and b)

B= C- A :- resistant formula

bxb= cxc+ axa - 2CA cos@( consider @ as theta)

8x8= 10x10+ 6x6- 2x10x6 cos@

64= 100+36- 120 cos@

64-136= 120 cos@

72= 120 cos@

cos@= 72/120

@= (cos)-1 3/5

Explanation: