A 20 m long ladder rests against a wall so that the angle between the ladder and the wall is 30°. How far (in m) is the base of the ladder from the wall?
Show answer & explanation
Correct answer: D
Explanation
The correct answer is option 4 i.e. 10
Length of ladder = 20 m
The angle between the ladder and the wall = 300
In the right-angled triangle ABC -
sin 300 = BC/AB
1/2 = BC/20
BC = 20/2 = 10m