Answer:
Explanation:
the square has perimeter P=48
P/4=48/4=12 each side is 12
to find the diagonal, you have an isosceles right triangle,
diagonal d,
d^2=a^2+a^2
d^2=144+144=288
d=sqrt288=17 (aprox)
I think it should be 12. If you get it wrong, im sorry
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