Answer variants:
15
2.878
17.878
A boy observes a dog, at an angle of 40\(^{\circ}\) from the top of the building, 15 \(m\) above the ground. The dog runs towards the building from a distance, and its angle from the top of the building is \(45^{\circ}\). Find the distance the dog has moved. (Use \(tan \ 40^{\circ} = 0.839\))
Answer:
The dog moved about a distance of \(m\).