Perimeter = sum of all side lengths. For a square, s1 = s2 ... = s4, so
Perimeter = 5+5+5+5 = 4(5) = 20cm
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Then the square will have 4 equal sides of 5cm with a perimeter of 20cm and an area of 25 square cm
9cm + 5cm + 9cm + 5cm = 28cm
A square has all four sides the same length, so perimeter = 4 x side length.4 x 5cm = 20cm.
20
Perimeter = 5*5 = 25 cm