SOLUTION: Find the angle between two vectors (5,2) and (-2,5)

Question 70173: Find the angle between two vectors (5,2) and (-2,5)
Answer by stanbon(75887) (Show Source): You can put this solution on YOUR website!
Find the angle between two vectors (5,2) and (-2,5)
Plot the two points; that is, draw the two vectors.
vector (5,2) makes an angle of tan^-1(2/5) with the positive x-axis
vector (-2,5) makes an angle of [90 + tan^-1(2/5)] with the positive x-axis.
Then the desired angle = [90-tan^-1(2/5)]-tan^-1(2/5)= 90 degrees.
Cheers,
Stan H.
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