Question

A ladder 20 mts high just reaches the top of a wall of height 10 mts then the ladder makes an angle with horizon is

Answer 1

Hi ,

Draw the rough diagram which shows the details of the problem

Diagram shows a right angled triangle ABC . Right angle at

Let the length of ladder AC = 15 m ( hypotenuse )

Angle between ladder and wall < BCA= 60 degrees

Angle between ladder and the ground < CAB = 90 - 60 = 30 degrees

Height of the wall = BC

From triangle ABC,

Sin

Sin 30 = BC / 15

1 / 2 = BC / 15

15 / 2 = BC

7.5 = BC

Therefore,

Height of the wall = BC = 7.5 m

I hope this will useful to you.

*****

Answer 2

TAKE A RIGHT TRIANGLE ABC ,C IS THE RIGHT ANGLE

AB-20

BC-BASE

CA-10

SINB=10/20

        =1/2

SINB=SIN30

THEREFORE B=30

30 IS THE REQUIRED ANGLE

PLS MARK AS BRAINLIEST