Verified Answer :

Jewelz07

They are all 10mm long because 10*4 is 40mm so hoped I helped

Since the perimeter of the square is 40 then you will divide 40 by 4 wich will equal 10, so each side of the square is 10 mm long.

My Work:

40/4= 10
10+10+10+10=40 or 10x4=40

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