Area
Area
While perimeter is the distance around a shape, area refers to the amount of space inside a shape. If you want to carpet or tile a floor or paint a room, it is important to know the area of that space.
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This rectangle represents the floor of Mr. Smith's living room. It has a length of 6 m and a width of 4 m. What amount of carpet should he buy to completely cover his floor?
How many squares are inside the rectangle? Count them.
What is 6 x 4?
The area of his room is 24 square meters abbreviated as 24 m2.
Here, it is shown that multiplying the length and width of a rectangle results in its area. This gives us the formula, area = length x width.
A = L x W
Using the formula to calculate area.
A = L x W
A = L x W
= 2 x 4
= 2 x 4
= 8 km2
= 8 km2
A = L x W
A = L x W
= 9 x 9
= 9 x 9
= 81 cm2
= 81 cm2
Note that this is a square in which all the sides are equal.
Use the formula to calculate the area of these rectangles?
Lesson 2
Lesson 2
Calculate the perimeter and area of these rectangles.
Calculate the perimeter and area of these rectangles.
P = ____ + ____ + ____ + ____
= ____ ft
A = L x W
= ____ x ____
= ____ ft2
P = ____ + ____ + ____ + ____
= ____ cm
A = L x W
= ____ x ____
= ____ cm2
Home Work - Sketch each shape then calculate its perimeter and area.
Home Work - Sketch each shape then calculate its perimeter and area.
Length Width
Length Width
4 cm 3 cm
9 ft 1 ft
8 in 8 in
12 m 12 m
Lesson 3
Lesson 3
Read each problem carefully then calculate the answer. If necessary, you can sketch the rectangle to help with the calculation.
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