What is the perimeter of the rectangle?

Number 3

Step 1: Count the number of unit squares in the figure for the area.
The figure is an L-shape made of 4 unit squares.
$Area = 4 \ square units$

Step 2: Calculate the perimeter by counting external edges or using the formula: perimeter = $4 \times$ (number of squares) $- 2 \times$ (number of shared edges).
Number of squares = 4.
Number of shared edges = 3.
$Perimeter = 4 \times 4 - 2 \times 3 = 16 - 6 = 10 \ units$

Area = 4 square units, Perimeter = 10 units

Area = 4 square units, Perimeter = 10 units

Number 4

Step 1: Count the number of unit squares in the figure for the area.
The figure is a single blue square (1 unit square).
$Area = 1 \ square unit$

Step 2: Calculate the perimeter.
All 4 sides are external.
$Perimeter = 4 \ units$

Area = 1 square unit, Perimeter = 4 units

Area = 1 square unit, Perimeter = 4 units

Number 5

Step 1: Count the number of unit squares in the figure for the area.
The figure is a 2 by 2 square (4 unit squares).
$Area = 4 \ square units$

Step 2: Calculate the perimeter using formula: perimeter = $4 \times 4 - 2 \times 4 = 16 - 8 = 8$ units (4 shared edges).
Or $2$(length + width) = $2$(2 + 2) = 8 units.
$Perimeter = 8 \ units$

Area = 4 square units, Perimeter = 8 units

Area = 4 square units, Perimeter = 8 units

Number 6

Step 1: Count the number of unit squares in the figure for the area.
The figure is a straight line of 5 unit squares.
$Area = 5 \ square units$

Step 2: Calculate the perimeter: 4 ends + 2 sides along length $\times 5$, but using formula.
Number of shared edges = 4.
$Perimeter = 4 \times 5 - 2 \times 4 = 20 - 8 = 12 \ units$

Area = 5 square units, Perimeter = 12 units

Area = 5 square units, Perimeter = 12 units

Number 7

Step 1: Count the number of unit squares in the figure for the area.
The figure has 6 unit squares (e.g., 2x3 rectangle).
$Area = 6 \ square units$

Step 2: Calculate the perimeter: number of shared edges = 7.
$Perimeter = 4 \times 6 - 2 \times 7 = 24 - 14 = 10 \ units$

Area = 6 square units, Perimeter = 10 units

Area = 6 square units, Perimeter = 10 units