Question

Can anyone help me to solve the question

Answer 1

I think the image above will help you.

Answer 2

x = 2
`√(10)`

Explanation:

Using Pythagoras' identity in the right triangle

The square on the hypotenuse is equal to the sum of the squares on the other 2 sides , that is

x² + 9² = 11²

x² + 81 = 121 ( subtract 81 from both sides )

x² = 40 ( take square root of both sides )

x =
`√(40)` =
`√(4(10))` =
`√(4)` ×
`√(10)` = 2
`√(10)` ≈ 6.32 ( to 2 dec. places )