Perimeter worksheet Grade 4 CAPS aligned • Teacha! - Free Printable

To calculate the perimeter of each shape, we need to add up the lengths of all the sides. Let's go through each shape step by step.

---

1. Rectangle

- Given dimensions: Length = 12 cm, Width = 7 cm
- Formula for perimeter of a rectangle: \( P = 2 \times (\text{Length} + \text{Width}) \)
- Calculation:
\[
P = 2 \times (12 \, \text{cm} + 7 \, \text{cm}) = 2 \times 19 \, \text{cm} = 38 \, \text{cm}
\]
- Perimeter: \( \boxed{38 \, \text{cm}} \)

---

2. Square

- Given side length: 80 mm
- Formula for perimeter of a square: \( P = 4 \times \text{Side} \)
- Calculation:
\[
P = 4 \times 80 \, \text{mm} = 320 \, \text{mm}
\]
- Perimeter: \( \boxed{320 \, \text{mm}} \)

---

3. Triangle

- Given side lengths: 10 cm, 7 cm, 6 cm
- Formula for perimeter of a triangle: \( P = \text{Side}_1 + \text{Side}_2 + \text{Side}_3 \)
- Calculation:
\[
P = 10 \, \text{cm} + 7 \, \text{cm} + 6 \, \text{cm} = 23 \, \text{cm}
\]
- Perimeter: \( \boxed{23 \, \text{cm}} \)

---

4. Trapezoid

- Given side lengths: 5 cm, 6 cm, 6 cm, 8 cm
- Formula for perimeter of a trapezoid: \( P = \text{Side}_1 + \text{Side}_2 + \text{Side}_3 + \text{Side}_4 \)
- Calculation:
\[
P = 5 \, \text{cm} + 6 \, \text{cm} + 6 \, \text{cm} + 8 \, \text{cm} = 25 \, \text{cm}
\]
- Perimeter: \( \boxed{25 \, \text{cm}} \)

---

5. Pentagon

- Given side lengths: All sides are 12 cm (regular pentagon)
- Formula for perimeter of a regular pentagon: \( P = 5 \times \text{Side} \)
- Calculation:
\[
P = 5 \times 12 \, \text{cm} = 60 \, \text{cm}
\]
- Perimeter: \( \boxed{60 \, \text{cm}} \)

---

Final Answers

1. Rectangle: \( \boxed{38 \, \text{cm}} \)
2. Square: \( \boxed{320 \, \text{mm}} \)
3. Triangle: \( \boxed{23 \, \text{cm}} \)
4. Trapezoid: \( \boxed{25 \, \text{cm}} \)
5. Pentagon: \( \boxed{60 \, \text{cm}} \)