Let’s solve each problem step by step.
Remember: The perimeter of a rectangle is the total distance around it.
You add up all four sides.
Since opposite sides are equal, you can use this formula:
Perimeter = 2 × (length + width)
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Problem 1:
Length = 9 cm, Width = 3 cm
Perimeter = 2 × (9 + 3) = 2 × 12 =
24 cm
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Problem 2:
Length = 6 mm, Width = 4 mm
Perimeter = 2 × (6 + 4) = 2 × 10 =
20 mm
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Problem 3:
This is a square (all sides equal), but we still use the same idea.
Side = 7 cm
Perimeter = 2 × (7 + 7) = 2 × 14 =
28 cm
*(Or just 7 + 7 + 7 + 7 = 28 cm)*
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Problem 4:
Length = 10 m, Width = 4 m
Perimeter = 2 × (10 + 4) = 2 × 14 =
28 m
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Problem 5:
Length = 8 m, Width = 7 m
Perimeter = 2 × (8 + 7) = 2 × 15 =
30 m
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Problem 6:
This is also a square. Side = 20 cm
Perimeter = 2 × (20 + 20) = 2 × 40 =
80 cm
*(Or 20 + 20 + 20 + 20 = 80 cm)*
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Final Answer:
1) 24 cm
2) 20 mm
3) 28 cm
4) 28 m
5) 30 m
6) 80 cm
Parent Tip: Review the logic above to help your child master the concept of area and perimeter worksheet grade 7.
