A boat is anchored on a calm river at a point that is 120 m horizontally from the…
MATHEMATICS · Multi-part · CBSE · Mathematics · Applications of Trigonometry · Applications of Trigonometry
Problem
A boat is anchored on a calm river at a point that is 120 m horizontally from the foot of a vertical cliff. The angle of elevation from the boat to the top of the cliff is 45∘. A flagstaff 5 m high is fixed at the edge of the cliff's top.
(i) Find the height of the cliff.
(ii) Calculate the angle of elevation from the boat to the top of the flagstaff. Give your answer to the nearest degree.