Question

A 36 m tall ladder is leaning against
a wall 18 m high such that it just
touches the top of the wall. What is
the elevation of the wall at the base
of the ladder?
(1) 30°
(2) 45°
(3) 50°
(4) 60°​

Answer 1

Answer:

30 degrees

Step-by-step explanation:

The hypotenuse of the traingle so formed=36

Altitude of triangle=18

base of triangle= 36square-18 square= 31(approx)

Sin theta=18/36=1/2

We know that 1/2 is the sin of 30degrees theeta,

answer is (1) 30 degrees

Answer 2

Let, the angle = Ø

Sin Ø = p/h

Sin Ø = 18/36

Sin Ø = 1/2

Sin Ø = 30°