Answer:
3
Explanation:
A square has 4 equal sides
so
4(x+3) = perimeter = 24
4x+12 = 24
4x = 12
x=3
3 cm
4(x + 3) = 24
4x + 12 = 24
x = 3 cm
**multiply by 4 because a square has 4 equal sides***
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