A ladder 41 m long just reaches the top of a building 40 m high from the ground. Find the distance of the foot of the ladder from the building.
Answer:
9 m
- Let AB be the building and CB be the ladder.
Then, AB=40 m, CB=41 m and ∠CAB=90∘. - By pythagoras' theorem, we have Hence, the distance of the foot of the ladder from the building is .