Solve the each part of given question:
Question: Two dogs pull horizontally on ropes attached to a post; the angle between the ropes is 53.0 degree. Dog A exerts a force of 282N and dog B exerts a force of 320N.
Part I: Find the magnitude of the resultant force.
Part II: Find the angle the resultant force makes with dog A's rope.
I know the correct answer for above question but explain how to get this answer! Thanks.