So here is how I analyzed the given problem above. If you are going to imagine the image, you can see that both the tree and the building are perpendicular to the ground. Perpendicular meaning, they formed a 90 degree angle. And it is stated that the rope also touches the top of a tree between the stake and the building at a 48º angle. Therefore, the angles created at this intersection would be congruent. So, the angle formed by the rope and the building is also 48°. Hope this answer helps.
