area and its boundary

The distance around the

outside of a shape is called the boundaries.

8 cm

6 cm

8 cm

6 cm

The boundary of the shape is 8 + 6 + 8 + 6 = 28cm.

First we need to find he length of each side by counting the squares.

What is the boundary of each of these

shapes? Your teacher will give you copy of

the worksheet.

18cm 18cm

18cm22cm

26cm

Now find the boundary of these shapes. They are

not drawn to scale.

3cm

3cm

3cm

3cm

3cm

3cm

5cm

7cm7cm

3cm

4cm 4cm

4cm 4cm

3cm 3cm

3cm3cm

Boundary = 18cm Boundary = 22cm Boundary = 28cm

The area of a shape is the

amount of space inside it.

The area of the shape is 18cm2.

To find out how much shape is inside we cancount the squares.

What is the area of each of these

shapes? Your teacher will give you copy of

the worksheet.

12cm2

26cm2

26cm2

To find the area ofan irregular shape you first count the full squares inside

it.

This is an irregular shape. This

means that the sides aren’t

straight.

You then count all the other squares which have more than half the area

covered.

The area of the shape is 60cm2.

What is the area of each of these

shapes? Your teacher will give you copy of

the worksheet.

24cm225cm2

22cm2

35cm2

Counting each square can take a long time. Does anyone know a quicker way?

The area of the shape is 48cm2.

The rectangle is made of 6 rows of 8 squares.

To work out the number of squareswe times 6 by 8.