Respuesta :

The length is 11.5 cm.

What is Pythagoras theorem?

The sum of the squares on the legs of a right triangle is equal to the square on the hypotenuse

Given: diagonal = 20 cm

In ABC,

AC² = BC² + AB²

AC²= x² + x²

AC²= 2x²

AC= √2 x

IN ACF,

AF² = AC² +CF²

20²=  2x² + x²

400= 3x²

400/3= x²

x= 11.5

hence, length is 11.5 cm.

Learn more about Pythagoras theorem here:

https://brainly.com/question/343682

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