2 ObjectivesTo calculate areas of rectanglesTo calculate areas of polygons made of rectangles
3 Area is the measure of how much space a shape takes up Area is the measure of how much space a shape takes up. We measure it in squares such as square centimetres or metres etc.1 cmThis rectangle takes up 28 squares.It has an area of 28 square centimetres28 cm212345678910111213141516171819202122232425262728
4 It could take a long time to cover shapes in squares It could take a long time to cover shapes in squares. Luckily there is an quicker way.7 cm4 cm×= 28 cm2
5 Area of a rectangle = length × breadth Use this formulae to find the area of rectangles.lengthbreadthArea of a rectangle = length × breadth
6 Can you find the areas of these rectangles? 5 cm3 cm2 cm7 cm15 cm214 cm27 m49 m2
7 Can you think of a way to find the area of this shape? 5 cm6 cm7 cm3 cm12 cm
8 Split the shape into rectangles? 5 cm6 cm7 cm3 cm12 cm
9 Find the area of each rectangle? 5 cm5 × 6 = 30 cm27 × 3 = 21 cm26 cm7 cm3 cm
10 Add the areas together to find the area of the complete shape? = 51 cm230 cm221 cm2
11 Can you find the areas of these shapes? 11 cm5 cm7 cm4 cm2 cm6 m22 m23 m4 m43 cm21 m4 m
12 Clue: Take the area of the hole from the area of the whole! Here is a challenge can you work out the area of this shape with a hole in it?2 cm5 cm5 cm10 cmClue: Take the area of the hole from the area of the whole!50 cm2 – 10 cm2 = 40 cm2
13 Area of a rectangle = length × breadth Remember:Area of a rectangle = length × breadthlengthbreadthSplit more complicated shapes into rectangles and find the area of each rectangle then add them together.Over to you.
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