To find the perimeter of a rectangle, you add up the lengths of all four sides. Since opposite sides of a rectangle are equal, you can also use this formula:
Perimeter = 2 × (length + width)
Let’s solve each problem one by one.
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1) Rectangle with length 9 cm and width 3 cm
Perimeter = 2 × (9 + 3) = 2 × 12 =
24 cm
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2) Rectangle with length 6 in and width 4 in
Perimeter = 2 × (6 + 4) = 2 × 10 =
20 in
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3) Square with side 7 ft
*(Note: A square is a special rectangle where all sides are equal)*
Perimeter = 2 × (7 + 7) = 2 × 14 =
28 ft
*(Or simply 4 × 7 = 28 ft — same result)*
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4) Rectangle with length 10 m and width 4 m
Perimeter = 2 × (10 + 4) = 2 × 14 =
28 m
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5) Rectangle with length 8 m and width 7 m
Perimeter = 2 × (8 + 7) = 2 × 15 =
30 m
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6) Square with side 20 cm
Perimeter = 2 × (20 + 20) = 2 × 40 =
80 cm
*(Or 4 × 20 = 80 cm — same result)*
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Final Answer:
1) 24 cm
2) 20 in
3) 28 ft
4) 28 m
5) 30 m
6) 80 cm
Parent Tip: Review the logic above to help your child master the concept of perimeter of a rectangle worksheet.
