40 cm (10cm x 4 sides = 40cm)
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5 cm + 5 cm + 5 cm + 5 cm or 10 cm + 10 cm
If each side of a square is 10 cm, the perimeter is 4 x 10 cm = 40 cm.
Perimeter is the distance around an object. A square will have 4 equal sides of 10 cm, so it will take 40 cm to get all the way around. In short 40 cm
Perimeter of square: 19+19+19+19 = 76 cm
Perimeter of the square: 17+17+17+17 = 68 cm