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Sagot :
Answer:
10
Step-by-step explanation:
Should be right
ThIs iS aN AMazInG AnswEr
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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