Perimeter of a square = 4*side = 4*3 cm = 12 cm.
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Square side 3cm. Rectangle 2cm x 4cm. Equilateral triangle side 4cm.
For a square, all 4 sides are the same length, so perimeter is 4 times length of a side. So, 4 x 3cm = 12 cm
Well, honey, if we're talking about a square with sides that are all 3cm long, then each side is, surprise surprise, 3cm in length. It's a square, not a triangle – all sides are equal. So, grab a ruler, measure it out, and you'll see that each side is indeed 3cm.
A square has 4 sides of equal length The perimeter is the sum of the lengths of the four sides each side has length 3 cm 3+3+3+3 = 12 cm perimeter
12cm (4 sides x 3 = 12)