Area and Perimeter

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Area and Perimeter by Pitchford, revised.

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Presentation Transcript

Slide 1: 

Area and Perimeter

Slide 2: 

8 cm 6 cm 8 cm 6 cm The perimeter of the shape is 8 + 6 + 8 + 6 = 28cm. First we need to find the length of each side by counting the squares.

Slide 3: 

What is the perimeter of each of these shapes? Your teacher will give you copy of the worksheet. 18cm 18cm 18cm 22cm 26cm

Slide 4: 

Now find the perimeter of these shapes. They are not drawn to scale. Perimeter = 18cm Perimeter = 22cm Perimeter = 28cm

Slide 5: 

The area of the shape is 18cm2. To find out how much shape is inside we can count the squares.

Slide 6: 

What is the area of each of these shapes? Your teacher will give you copy of the worksheet. 12cm2 26cm2 26cm2

Slide 8: 

The area of the shape is 60cm2.

Slide 9: 

What is the area of each of these shapes? Your teacher will give you copy of the worksheet. 24cm2 25cm2 22cm2 35cm2

Slide 10: 

The area of the shape is 48cm2. The rectangle is made of 6 rows of 8 squares. To work out the number of squares we times 6 by 8.

Slide 11: 

What is the area of each of these shapes? Your teacher will give you copy of the worksheet. 20cm2 18cm2 14cm2 30cm2 22cm2

Slide 12: 

We can work out the area of a rectangle without the grid. length width Area = length x width

Slide 13: 

Now work out the area of these rectangles. They are not drawn to scale. 36cm2 35cm2 20cm2 25cm2 4cm 9cm 7cm 5cm 5cm 4cm 2cm 12.5cm

Slide 14: 

A shape that is made from other shapes is known as a composite shape. To find the area of this shape we have to split it up into two rectangles. 10cm 8cm 8cm 2cm 4cm 4cm Area = 4 x 10 40cm2 Area = 4 x 8 32cm2 Total area = 40 + 32 = 72 cm2

Slide 15: 

Find the area and perimeter of each of these shapes? Your teacher will give you copy of the worksheet. 9cm 5cm 5cm 2cm 4cm 5cm 4cm 2cm 11cm 7cm 4cm 3cm 3cm 3cm 7cm 4cm

Slide 16: 

9cm 5cm 5cm 2cm 4cm 5cm 4cm 2cm Area = 5 x 9 45cm2 Area = 4 x 5 20cm2 Total area = 45 + 20 = 65 cm2 Perimeter = 36 cm

Slide 17: 

Area = 2 x 5 10cm2 Area = 6 x 6 36cm2 Total area = 10 + 36 = 46 cm2 Perimeter = 34 cm

Slide 18: 

11cm 7cm 4cm 3cm 3cm 3cm 7cm Total area = 28 + 16 + 21 = 65 cm2 Perimeter = 42 cm Area = 4 x 7 Area = 4 x 4 4cm Area = 3 x 7 21cm2 28cm2 16cm2 There is another way of doing this question.

Slide 19: 

11cm 7cm 4cm 3cm 3cm 3cm 7cm Total area = 77 – 12 = 65 cm2 Perimeter = 42 cm Area = 7 x 11 Area = 3 x 4 4cm 77cm2 12cm2

Slide 20: 

Well Done