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Published byRobert Lockhart Modified over 2 years ago

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Finding the Area of a Rectangle

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Area of a Rectangle Objectives To calculate areas of rectanglesTo calculate areas of rectangles To calculate areas of polygons made of rectanglesTo calculate areas of polygons 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 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 × breadth length breadth

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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? = 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 breadth Split more complicated shapes into rectangles and find the area of each rectangle then add them together. Over to you.

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