SOLUTION: What is the angle between vectors a= (1,2) and b= (1,− 1/2).

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Question 1156494: What is the angle between vectors
a= (1,2) and b= (1,− 1/2).
Answer by ikleyn(52915) About Me  (Show Source):
You can put this solution on YOUR website!
.

The scalar product of these vectors is equal to zero --- hence, they are orthogonal, i.e. perpendicular.

So, the angle between them in the coordinate plane is 90 degrees.