6+4+6+4=20 cm
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Area: 54 square cm Perimeter: 30 cm
3 cm x 6 sides = 18 cm perimeter
The perimeter and area don't depend on each other. Knowing one doesn't tell you the other. -- A circle with perimeter (circumference) of 20 cm has area of 31.83 cm2. -- A square with perimeter of 20 cm has area of 25 cm2 . -- A (9 x 1) rectangle has perimeter of 20 cm and area of 9 cm2 . -- A (8 x 2) rectangle has perimeter of 20 cm and area of 16 cm2 . -- A (7 x 3) rectangle has perimeter of 20 cm and area of 21 cm2 . -- A (6 x 4) rectangle has perimeter of 20 cm and area of 24 cm2 .
Since a square has 4 sides, if each side is 7.5 cm long, then the perimeter is 4 x 7.5 cm = 30 cm.
4 cm by 6 cm