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Answer :

Hermanc156go

Answer:

10

Step-by-step explanation:

Should be right

ThIs iS aN AMazInG AnswEr

Kmyamccastergo

Answer:

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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