Answer:
The angle is 50.2°.
Step-by-step explanation:
The tree and its shadow from a right triangle with the tree being the perpendicular and the shadow being the base as shown in the figure attached.
Therefore the angle θ formed by the sun's rays and the ground is:
[tex]\theta = tan^-1(\frac{18}{15} )=\boxed{50.2^o}[/tex]
