# (Urgent) Finding the angle between A and B. Using magnitudes and the sum of vectors

1. Homework Statement

Vectors A and B have equal magnitudes of 15.0. If the sum of A and B is the vector 4.55 j, determine the angle between A and B.

3. The Attempt at a Solution

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Try looking at

$$({\bf A} + {\bf B})\bullet({\bf A} + {\bf B})$$

Last edited:
Simon Bridge