Let's solve each shape's
perimeter step by step. The
perimeter is the total distance around a two-dimensional shape, which means we add up the lengths of all the sides.
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🔹 1. Rectangle (Top Left)
- Sides: 9 cm, 4 cm, 9 cm, 4 cm
- Perimeter = 9 + 4 + 9 + 4 =
26 cm
>
✔ Perimeter = 26 cm
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🔹 2. Triangle (Top Right)
- Sides: 3 mm, 11 mm, 15 mm
- Perimeter = 3 + 11 + 15 =
29 mm
>
✔ Perimeter = 29 mm
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🔹 3. Square (Middle Left)
- All sides: 5 mm
- Perimeter = 5 + 5 + 5 + 5 =
20 mm
>
✔ Perimeter = 20 mm
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🔹 4. Trapezoid (Middle Right)
- Sides: 8 m, 5 m, 3 m, 8 m
- Perimeter = 8 + 5 + 3 + 8 =
24 m
>
✔ Perimeter = 24 m
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🔹 5. Arrow-shaped Pentagon (Bottom Left, Yellow)
- Sides: 7 cm, 5 cm, 7 cm, 2 cm, 2 cm
- Perimeter = 7 + 5 + 7 + 2 + 2 =
23 cm
>
✔ Perimeter = 23 cm
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🔹 6. Equilateral Triangle (Bottom Middle, Blue)
- All sides: 6 km
- Perimeter = 6 + 6 + 6 =
18 km
>
✔ Perimeter = 18 km
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🔹 7. Right Triangle (Bottom Left, Red)
- Sides: 4 km, 3 km, 5 km
- Perimeter = 4 + 3 + 5 =
12 km
>
✔ Perimeter = 12 km
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🔹 8. Parallelogram (Bottom Right, Orange)
- Sides: 8 cm, 4 cm, 8 cm, 4 cm
- Perimeter = 8 + 4 + 8 + 4 =
24 cm
>
✔ Perimeter = 24 cm
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✔ Final Answers:
| Shape | Perimeter |
|------|-----------|
| Rectangle |
26 cm |
| Triangle |
29 mm |
| Square |
20 mm |
| Trapezoid |
24 m |
| Arrow-shaped Pentagon |
23 cm |
| Equilateral Triangle |
18 km |
| Right Triangle |
12 km |
| Parallelogram |
24 cm |
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✔ All perimeters calculated! Just remember:
👉
Perimeter = sum of all side lengths
No need for formulas unless you want to use shortcuts (like for rectangles: $ P = 2(l + w) $), but adding sides directly works every time!
Let me know if you'd like this as a printable answer sheet! 😊
Parent Tip: Review the logic above to help your child master the concept of perimeter 3rd grade worksheet.
