Step-by-step explanation:
For this, we need to apply the Pythagoras theorem.
What this states?
It states that the sum of the squares of base and height of a right angle Triangle is equal to the square of hypotenuse of the triangle.
So, according to figure, a rectangle also has 90° angle.
65 being hypotenuse, 56 being base, we need height.




And height is equal to x. So, 33 is the answer.