Answer:
100.8 cm
Explanation:
Area of square= side * side
let,
side=x
Substitute values in above formula:
635
=x*x
=635

Taking square root on both sides:
x=25.2cm
side=25.2cm
Now, Permiter=4* side
Perimeter=4*25.2cm
Perimeter=100.8 cm
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