For this case we can use the following trigonometric relationship: tan (theta) = y / x Substituting values we have: tan (theta) = (4/5) / (3/5) Rewriting we have: tan (theta) = 4/3 Clearing theta: theta = Atan (4/3) theta = 53.13 degrees Answer: the approximate value of teta is: theta = 53.13 degrees