Area

AREARemember: The perimeter of a shape is a measure of distance around the outside.

The area of a shape is a measure of the surface/space contained within its perimeter.

Area is measured in units2Units of distance

mm

cm

m

km

inches

feet

yards

miles

Units of area

mm2

cm2

m2

km2

inches2

feet2

yards2

miles2

1 cm 1 cm2

1 cm

1 cm

18 cm2

6 cm

3 cm

Area = 6 cm x 3 cm = 18 cm2

Metric

Imperial

Metric

Imperial

Area of Rectangle

Rectangle Length Width Area

1

2

3

6 cmArea = length x width

= 10 cm x 6 cm = 60 cm squares

10 cm

2 mm

7 mmArea = length x width

= 7mm x 2mm = 14 mm squares

Examples

On your white boards

4 m

2 m

8 m2

5 m

3 m

15 m2

7 m

4 m

28 m2

6 m

3 m

18 m2

On your note

book

Page 149

Area of Square

Square Length Width Area

1

2

3

3 mm 5 m

Area = S x S =

= 10 x 10 = 100 cm2

7 mm

Area = S x S =

= 7 x 7= 49 mm2

10 cm

4

Examples

8 m

16 m2

On your whiteboard

64 m2

4 m

9 m

81 m2 36 m2

6 m

On your note

book

Page 149

Area of rectangle = 60 cm2 , length = 10 cm Find width ..

Area of rectangle = 45 cm2 , width = 5 cm Find length.

Area of square = 25cm2 , Find side length

Area of square = 81cm2 , Find side length

Complete your worksheet

Area of Triangle

5 m 81 m225 m29 m

7 m

4 m

28 m26 m

2 m

12 m2

Find the Area

Warm up

• Draw rectangle with length= 8 cm , width = 10 cm

• Find the area of the rectangle

• Draw a line between opposite angles ( diagonal )

Activity

• Cut the line

•What shape you’ve got

Area of a Triangle

The area of a triangle = ½ the area of the surrounding rectangle/parallelogram

Area of a triangle = ½ base x height

length

width

base

heigh

Find the area of the following triangles.

8 cm

14 cm

9 cm

16 cm

2 m

4 m

Example

On your whiteboard

6 mm

5 mm 4 m

3 m

20 cm2

21cm2

15 mm2

6 m2

On your note book Page 155

What did we learn today?

Textbook Page 155

Question 3 a , b , c Question 4 c

Check Homework

Area of Parallelogram

With your partner

• Draw perpendicular line from one angle to the base

• Cut the line and add it to the other end

•What shape you’ve got

base

height

base

height

Area of a Parallelogram

The area of a parallelogram

= the area of a rectangle on the

same base.Area = base x height

Area = base x height

8 cm

8mm

5 m

12 cm

5 mm

6 m

Find the area of each parallelogram below.

12

3

On your Whiteboard

4 mm

9 mm

5 cm

10cm

78 cm2

63 cm2

36 mm2

50 cm2

Complete your

Worksheet

What did we learn today?