Let’s solve each rectangle’s perimeter step by step.
Remember:
Perimeter of a rectangle = 2 × (length + width)
Or you can add all four sides: length + width + length + width
---
1) Rectangle with sides 9 cm and 3 cm
Add all sides: 9 + 3 + 9 + 3 = 24 cm
Or: 2 × (9 + 3) = 2 × 12 = 24 cm
✔ Perimeter =
24 cm
---
2) Rectangle with sides 6 in and 4 in
Add all sides: 6 + 4 + 6 + 4 = 20 in
Or: 2 × (6 + 4) = 2 × 10 = 20 in
✔ Perimeter =
20 in
---
3) Square (special rectangle) with sides 7 ft and 7 ft
Add all sides: 7 + 7 + 7 + 7 = 28 ft
Or: 2 × (7 + 7) = 2 × 14 = 28 ft
✔ Perimeter =
28 ft
---
4) Rectangle with sides 10 m and 4 m
Add all sides: 10 + 4 + 10 + 4 = 28 m
Or: 2 × (10 + 4) = 2 × 14 = 28 m
✔ Perimeter =
28 m
---
5) Rectangle with sides 8 m and 7 m
Add all sides: 8 + 7 + 8 + 7 = 30 m
Or: 2 × (8 + 7) = 2 × 15 = 30 m
✔ Perimeter =
30 m
---
6) Square with sides 20 cm and 20 cm
Add all sides: 20 + 20 + 20 + 20 = 80 cm
Or: 2 × (20 + 20) = 2 × 40 = 80 cm
✔ Perimeter =
80 cm
---
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 finding the perimeter worksheet.
