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## Homework Statement

If theta is the angle between two non-zero vectors A and B, then which of the following angles theta results in A dot B = |A x B|?

## Homework Equations

A dot B = ABcos(theta)

A x B = ABsin(theta)

## The Attempt at a Solution

There were two choices in the multiple choice answers where cos(theta) = |sin(theta)|

1 is 225 degrees and the other is 315 degrees. The correct answer is 315 degrees. Can somebody explain or help illustrate why 225 is wrong and 315 is right?