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## Homework Statement

Two vectors are given by Avec = -1 i + 2 j and Bvec = 4 i + 2 j

Find A X B

Find the angle between A and B

## The Attempt at a Solution

Okay well I got the First part of the problem, I know that A X B is -10, but when I do everything for the angle I keep getting the wrong answer.

After I finish with my calculating I come up with cos (theta) = -10/10 which would simplify to 180 degrees, but thats wrong...

Can someone please help me out, I dont understand where im going wrong

Thank You!