Question

The length of a ladder is exactly equal to the height of the wall it is learning against. If lower end of the ladder is kept on a stool of height 3 m and the stool is kept 9 m away from the wall, the upper end of the ladder coincides with the top of the wall. Then the height of the wall is

Answer 1

hope it will help you

Answer 2

Let x be the height of the wall

(See attachment for a sketch of the diagram)

Solve x;

a² + b² = c²

(x - 3)² + 9² = x²

x² + 3² - 6x + 9² = x²

90 - 6x = 0

6x = 90

x = 15 m

Answer: The ladder is 15 tall.