WAEC Mathematics Past Questions & Answers - Page 227

1,133.

In the diagram, AB is a vertical pole and BC is horizontal. If |AC| = 10m and |BC| = 5m, calculate the angle of depression of C from A

A.

63o

B.

60o

C.

45o

D.

27o

Correct answer is B

In triangle ABC, \(\frac{BC}{AC} = \cos \theta\)

\(\implies \cos \theta = \frac{5}{10} = 0.5\)

\(\theta = \cos^{-1} (0.5) = 60°\)

1,134.

Which of the following bearings is equivalent to S50°W?

A.

040o

B.

130o

C.

220o

D.

230o

Correct answer is D

p>S50°W = 180° + 50°

= 230°

1,135.

A tree is 8km due south of a building. Kofi is standing 8km west of the tree. Find the bearing of Kofi from the building

A.

315o

B.

270o

C.

225o

D.

135o

Correct answer is C

The bearing of Kofi from the building = 180° + 45°

= 225°