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Published byJohn Holmes Modified about 1 year ago

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Which book needs more space? The Atlas needs more space because it has a bigger surface.

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Which shape needs more space? The yellow one needs more space.

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Which object needs more space? The amount of surface covered by the blackboard is called the area. BlackboardStudent’s desk

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Which shape has the larger area? Sometimes it is difficult to tell. So what do we need to do?

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We can use small squares to cover small objects. We can use sheets of newspaper to cover larger surfaces.

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The area of the shape can be found by ticking the square as each one is counted. How can we find the area of a shape which has been drawn on squared paper?

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Area = _____ square units. 12

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Area = _____ square units. 16

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Area = _____ square units. 20

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Area = _____ square units. 24

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Find the area of these shapes. Different shapes can have same area.

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Shapes can be made up of whole squares and half squares. Two halves make up one whole square.

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whole half Letter E has 15 whole squares and 1 half square. Area = 15 ½ square units

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Letter A has: whole 14 whole squares half 2 half squares (2 halves make 1 whole square) Area = square units = 15 square units

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This shape has: whole 20 whole squares half 12 half squares (2 halves make 1 whole square) Area = square units = 26 square units 12 half squares = 6 whole squares

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Area = _____ square units. ___ whole squares + ___ half squares

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Area = _____ square units. ___ whole squares + ___ half squares

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Area of letters and shapes can be found by using the nailboard.

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To take measurements we can use the: metre ruler measuring tape trundle wheel ruler

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1 square represents 1 cm Area = _____ square centimetres. 26

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1 square represents 1 cm Area = _____ square centimetres. 26 ___ whole squares + ___ half squares 244

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1 square represents 1 cm Area = _____ cm Area= 6.5 cm x 4 cm = 26 cm 2

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length breadth Area = length x breadth

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11 cm 7 cm Area = length x breadth = 11 cm x 7 cm = 77 cm 2

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LengthBreadth 6cm5cm 4cm 8cm3cm 9cm4cm 6cm 20cm8cm 30cm 2 20cm 2 24cm 2 36cm 2 160cm 2 Area

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1 cm 1 m Area = 1cm x 1cm = 1cm 2 Area = 1m x 1m = 1m 2 Large surfaces are measured in m 2

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Old Trafford Stadium has a length of 150 metres and a width of 50 metres. What is the area of this football ground? 150m 50m 150m 50m

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A field is 17m long and 15m wide. What is the area of the field? 17m 15m 17m

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The diagonal divides the rectangle into 2 equal triangles. 10 cm 6 cm = ½ (area of rectangle) Area of

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10 cm 6 cm Area of rectangle = 60 cm 2 Area of Area of each triangle = 30 cm 2 = ½ (length x breadth)

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4 cm 7 cm A B 8 cm 5 cm C 6 cm 10 cm 40 cm 2 30 cm 2 28 cm 2

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6 cm 12 cm 5 cm 10 cm A B

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4 cm 5 cm A Area of rectangle A = 5cm x 4cm = 20 cm 2

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Area of rectangle B = 10cm x 7cm = 70 cm 2 10 cm 7 cm B

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6 cm 12 cm 5 cm 10 cm A B rectangle A = 20cm 2 rectangle B = 70cm 2 + = 90cm 2 area

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5 cm 2 cm 11 cm 8 cm 28 cm 2 31 cm 2 55 cm 2

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14 cm 22 cm 8 cm 16 cm B A

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A Area of rectangle A = 22cm x 16cm = 352cm 2

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8 cm B Area of rectangle B = 14cm x 8cm = 112cm 2

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14 cm 22 cm 8 cm 16 cm B A Area of rectangle A = 352cm 2 Area of rectangle B = 112cm 2 - Area of border= 240cm 2

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A rectangular pond, 6m long and 4m wide, has a path 1.5m wide all around it. Find the area of this path.Pond 4 m 6 m 1.5 m 9m 7m

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7m 9m Pond Area of rectangle = 9m x 7m = 63m 2

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Pond Area of pond = 6m x 4m = 24m 2 6m 4m

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Pond 4 m 6 m 1.5 m 9m 7m Area of rectangle = 63m 2 Area of pond Area of path = 39m 2 = 24m 2 -

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