15. Determine the distance that the dog moved

A boy observes a dog, at an angle of 31\(^{\circ}\) from the top of the building, 4 \(m\) 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 \(tan \ 31^{\circ} = 0.601\))

 

Answer:

 

The dog moved about a distance of  \(m\).