The angle of elevation of a ladder leaning against a wall is 60° and the foot of the ladder is 4.5 m away from the wall.
The length of the ladder is: ​

Correct option is D

Given:

Angle of elevation = 60°

Distance of foot of ladder from wall = 4.5 m

Formula Used:

​$$\cos(\theta) = \frac{\text{base}}{\text{hypotenuse}}$$​​

Solution: 

From the formula;

hypotenuse = $$\frac{4.5}{\cos(60^\circ)} = \frac{4.5}{0.5} = 9 \text{ m}$$​​