A 9m long ladder rests at 9m below a vertical wall. If the angle of elevation of the top of the wall from the foot of the ladderis 60°. Find the height of the wall.

Height of the wall is 27 m.

Explanation:

Let the height of the wall = h

Length of the ladder = 9 m

Angle of elevation = 60°

Ladder rests at 9 m below a vertical wall.

So, length of the wall upto which the ladder rests = h - 9

We know,

Cos Ф = base/ hypotenuse

cos 60° = length of the ladder / height of wall upto which the ladder rests

So,

h - 9 = 18

h = 27

Therefore, height of the wall is 27 m

the answer is a

step-by-step explanation:

because if you put 1 in to the square root of x it equals 300.

the volume is the product of the area of the base, 3x(3x+4), and the height, 3x-1

step-by-step explanation: