29 . A
Mark up the figure. Call the sides of the square and the legs of the triangle each 1. What
you’re looking for is the measure of the angle marked x° in right triangle BDE:The leg opposite x is 1, and the leg adjacent to x is 2, so30 . C
The figure shows the head of touching the tail of , so those are the two vectors being
added. The result is because it then connects the tail of to the head of . Therefore,31 . A
Just plug θ = 50 and v = 30 into the formula and crank out the answer: