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Published byCecil Hood Modified over 4 years ago

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Finding the Area of a Rectangle

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Area of a Rectangle WALT: To calculate areas of rectanglesTo calculate areas of rectangles To calculate areas of polygons (2D shapes with straight lines) made of rectanglesTo calculate areas of polygons (2D shapes with straight lines) made of rectangles

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Area of a Rectangle 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 cm 1234567 891011121314 15161718192021 22232425262728 This rectangle takes up 28 squares. It has an area of 28 square centimetres 28 cm 2

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Area of a Rectangle It could take a long time to cover shapes in squares. Luckily there is an quicker way. 7 cm 4 cm × = 28 cm 2

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Area of a Rectangle Use this formulae to find the area of rectangles. Area of a rectangle = length × width length Width / breadth

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Area of a Rectangle How do we calculate area? It’s really easy! Measure the length. Measure the width. Multiply the length X width to calculate the area! l x w =

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Area of a Rectangle How do we write units of measurement for area? 50 square centimetres would be written as 50cm² 32 square metres would be written as 32m²

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Area of a Rectangle Can you find the areas of these rectangles? 5 cm 3 cm 15 cm 2 2 cm 7 cm 14 cm 2 7 m 49 m 2

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Area of a Rectangle Can you think of a way to find the area of this shape? 12 cm 6 cm 5 cm 7 cm 3 cm

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Area of a Rectangle Split the shape into rectangles? 12 cm 6 cm 5 cm 7 cm 3 cm

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Area of a Rectangle Find the area of each rectangle? 6 cm 5 cm 7 cm 3 cm 5 × 6 = 30 cm 2 7 × 3 = 21 cm 2

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Area of a Rectangle Add the areas together to find the area of the complete shape? 30 + 21 = 51 cm 2 30 cm 2 21 cm 2

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Area of a Rectangle Can you find the areas of these shapes? 11 cm 5 cm 7 cm 4 cm 2 cm 43 cm 2 6 m 4 m 3 m 4 m 1 m 22 m 2

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Area of a Rectangle Here is a challenge can you work out the area of this shape with a hole in it? 10 cm 5 cm 2 cm Clue: Take the area of the hole from the area of the whole! 50 cm 2 – 10 cm 2 = 40 cm 2

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Remember: Area of a rectangle = length × breadth length Widthbreadth Split more complicated shapes into rectangles and find the area of each rectangle then add them together. Now for the practical stuff

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