Find the length of the diagonal. 50 points for you plus a thanks, 5 star and brainliest.
(suggested a fast answer

10

Step-by-step explanation:

Should be right

Step-by-step explanation:

Let side be x

Using Pythagoras theorem

diagonal =hypotenuse

x²+x²=20²

2x²=400

x²=200

x=10√2

Side is 10√2

Perimeter=4×10√2=>40√2cm

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