If |a bar| = 2 , |b bar| = 5 and |a bar x b bar| = 8 , find a bar . b bar
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1
Answer:
idk
Explanation:
i nam not .........
Answered by
1
Answer: 6
Explanation: |a bar × b bar| = |a bar| × |b bar| sin θ
∴ 8 = 2 × 5 sin θ
∴ 8 = 10 sin θ
∴ sin θ = 4/5
∴ cos θ = 3/5 . . . . . . . . . . (∵ sin²θ + cos²θ = 1)
a bar × b bar = |a bar |×|b bar| cos θ
= 2 × 5 × 3/5
= 6
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