Asked by sumahr | 15th Jan, 2010, 07:04: PM
Since the two vectors are perpendicular, their dot product is zero.
(a+2b).(5a-4b) = 5a.a - 4a.b + 10b.a - 8b.b = 0
5 + 6a.b - 8 = 0
6a.b = 3
abcosθ = 1/2 ..................a = b = 1
cosθ = 1/2
θ = 60.
Answered by | 15th Jan, 2010, 09:10: PM
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