area and its boundary
TRANSCRIPT
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.