It is 28, HOWEVER, that is not a square- it is a rectangle. Squares have 4 equal sides.
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The length should be 6cm and the width is 4cm.
well if you have 6cm and 4cm it's not a square, it's a rectangle. you also mentioned that the length is 6cm. if you meant the area, this is length by width which is 24cm2. If you meant the perimeter this is 2w+2l, which is 20cm
21 cm
A square has four equal sides, so the length of each is (24/4) 6cm ■
How many sides has a square got? (4) So if all the sides are 6cm. Perimeter = 6 + 6 + 6 + 6 How many sides does an equilateral triangle have? (3) All the sides are the same length in these shapes so again: Perimeter = 6 + 6 + 6