(A) 2.3 m (X)
(B) 4.6 m (X)
(C) 7.8 m (X) (D) 9.2 m ()
Answers: The angle of elevation of a ladder leaning against a wall is 60° and the foot of the ladder is 4.6 m away from the wall. The length of the ladder is 9.2 m.
(A) 173 m (X)
(B) 200 m (X) (C) 273 m ()
(D) 300 m (X)
Answers: Two ships are sailing in the sea on the two sides of a lighthouse. The angles of elevation of the top of the lighthouse as observed from the two ships are 30° and 45° respectively. If the lighthouse is 100 m high, the distance between the two ships is 273 m.