The value of the marked angle is 37°
Using the concept of Trigonometry;
- Tangent = opposite / Adjacent
Substituting our values into the relation;
Tan(θ) = 39/52
Tan(θ) = 0.75
Taking the tan inverse of 0.75
θ = 36.87 ≈ 37°
The value of the marked angle is 37°