Asked by kelvin
If vector a + vector b + vector c = 0.and magnitude of a = 3,magitude of b = 5 and magnitude of c = 7.Find the angle between a and b?please anyone to help me i have exam tomorrow
Answers
Answered by
Steve
The three vectors form a triangle. So, recall the law of cosines.
c^2 = a^2 + b^2 - 2ab cosθ
c^2 = a^2 + b^2 - 2ab cosθ
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