Question

A ladder is placed against a wall such that it just
reaches the top of the wall. The length of the ladder is 7
m and the ladder is inclined at angle of 30° with the
ground. The height of the wall is
​

Answer 1

Explanation:

Length of the ladder = 7 m

Angle of inclination = 30°

Let the height of the wall it reaches be x.

Applying trigonometry,

h/7 = sin30°

=> h/7 = 1/2

=> h = 7/2 m = 3.5 m

Answer 2

Explanation:

Length of ladder ( Hypotenuse)= 7m

We have to find the height of wall

In triangle ABC

In triangle ABC sin30°=p/b

In triangle ABC sin30°=p/b 1/2 = p/7

In triangle ABC sin30°=p/b 1/2 = p/7

p = 7/2

p = 3.5 m