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Area & Perimeter Area of a rectangle = Area of a triangle = Area of a parallelogram = Area of a trapezium =

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Area & Perimeter Area of a rectangle = length x Breadth Area of a triangle = Area of a parallelogram = Area of a trapezium =

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Area & Perimeter Area of a rectangle = length x Breadth Area of a triangle = ½ x base x perpendicular height. Area of a parallelogram = Area of a trapezium =

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Area & Perimeter Area of a rectangle = length x Breadth Area of a triangle = ½ x base x perpendicular height. Area of a parallelogram = base x perpendicular height Area of a trapezium =

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Area & Perimeter Area of a rectangle = length x Breadth Area of a triangle = ½ x base x perpendicular height. Area of a parallelogram = base x perpendicular height Area of a trapezium = ½(a + b)h

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Area & Perimeter Area of a circle = Circumference of a circle =

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Area & Perimeter Area of a circle = r 2 Circumference of a circle =

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Area & Perimeter Area of a circle = r 2 Circumference of a circle = D or 2 r

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Example Calculate the area for each of the following shapes (i) 7.4cm 8.2cm 9.3cm

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(ii) 8cm 5cm

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(iii) (iv) 12cm 3.2m

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(v) 9cm 13cm 7cm

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Example Calculate the shaded region in the shape below 25m 13m

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Example The area of a circle is given as 205 m 2. What is its diameter?

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5cm Example Work out the circumference for each of the following circles (a)(b) 17mm

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45m Example Work out the perimeter of the semi circle drawn below

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Example Work out the radius of a circle which has an circumference of 30 centimetres.

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18cm 5cm Example Which has the largest perimeter?

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Chapter 9 Geometry © 2008 Pearson Addison-Wesley. All rights reserved.

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