Answer:
53.1°
Step-by-step explanation:
A rectangle triangle is formed, where 4/5 is the opposite side to θ and 3/5 is the adjacent side to θ (see figure attached).
From tangent definition:
tan θ = opposite/adjacent
tan θ = (4/5)/(3/5)
θ = tan^-1 (4/3)
θ = 53.1°
