To solve the problem of calculating the perimeters of the given rectangles and squares, we will use the following formulas:
1.
Perimeter of a Rectangle:
\[
\text{Perimeter} = 2 \times (\text{Length} + \text{Width})
\]
2.
Perimeter of a Square:
\[
\text{Perimeter} = 4 \times \text{Side Length}
\]
Let's calculate the perimeter for each shape step by step.
---
Problem 1: Rectangle (9 cm × 3 cm)
- Length = 9 cm
- Width = 3 cm
Using the formula for the perimeter of a rectangle:
\[
\text{Perimeter} = 2 \times (\text{Length} + \text{Width}) = 2 \times (9 + 3) = 2 \times 12 = 24 \, \text{cm}
\]
Answer for Problem 1:
\[
\boxed{24 \, \text{cm}}
\]
---
Problem 2: Rectangle (6 cm × 4 cm)
- Length = 6 cm
- Width = 4 cm
Using the formula for the perimeter of a rectangle:
\[
\text{Perimeter} = 2 \times (\text{Length} + \text{Width}) = 2 \times (6 + 4) = 2 \times 10 = 20 \, \text{cm}
\]
Answer for Problem 2:
\[
\boxed{20 \, \text{cm}}
\]
---
Problem 3: Square (7 cm × 7 cm)
- Side Length = 7 cm
Using the formula for the perimeter of a square:
\[
\text{Perimeter} = 4 \times \text{Side Length} = 4 \times 7 = 28 \, \text{cm}
\]
Answer for Problem 3:
\[
\boxed{28 \, \text{cm}}
\]
---
Problem 4: Rectangle (10 cm × 4 cm)
- Length = 10 cm
- Width = 4 cm
Using the formula for the perimeter of a rectangle:
\[
\text{Perimeter} = 2 \times (\text{Length} + \text{Width}) = 2 \times (10 + 4) = 2 \times 14 = 28 \, \text{cm}
\]
Answer for Problem 4:
\[
\boxed{28 \, \text{cm}}
\]
---
Final Answers:
1. Perimeter of the first rectangle: \(\boxed{24 \, \text{cm}}\)
2. Perimeter of the second rectangle: \(\boxed{20 \, \text{cm}}\)
3. Perimeter of the square: \(\boxed{28 \, \text{cm}}\)
4. Perimeter of the fourth rectangle: \(\boxed{28 \, \text{cm}}\)
Parent Tip: Review the logic above to help your child master the concept of perimeter of rectangle worksheet.
