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Published byMiguel Forbes Modified over 2 years ago

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Area and Perimeter Yes you do need to write this.

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AREA The amount of space inside a 2-dimensional object. Measured in square units cm 2, m 2, mm 2 Not to be confused with……

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Perimeter The distance around a two dimensional object. Measured in normal units eg. cm, m, mm

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Some shapes have there own formulas for area Yes, you do need to draw these as well.

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Rectangle b a Area of a rectangle = ab (length x width) Perimeter = 2a + 2b = 2(a + b)

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No, you dont have to try one.

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Parallelogram a b a is the vertical height Parallelogram – quadrilateral with two pairs of parallel sides. Area = ab Can not work out the perimeter with the information given.

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One to try 6cm 7cm Area = 6 x 7 =42 cm 2

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Triangle Area = ½ bh ( h is the vertical height) h b b

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Trapezium (a quadrilateral with one pair of parallel sides) a h b Add together the parallel sides, divide by 2 and then multiply by the distance between them. Area = (a + b) x h 2

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Example 2cm 10cm 5cm Area = (2 + 5) x 10 2 = 3.5 x 10 = 35 cm 2

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Compound Shapes These are shapes made by joining two or more shapes together. To find the area, find the area of the smaller shapes and add together.

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Example. 7cm 10cm 8cm 3cm 7cm 2cm 8cm 3cm X Y

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Example. Area of X = 7 x 2 = 14 cm 2 Area of Y = 3 x 8 = 24 cm 2 Total area = = 38 cm 2 7cm 2cm 8cm 3cm X Y

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Last one. Find the shaded area 10cm Area of square = 10 x 10 = 100 cm 2 A. of triangle = ½ x 3 x 4 = 6 cm 2 Shaded area = 100 – 6 = 94 cm 2 3cm 4cm

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The only part left is circles (always a circle question) And then its volume.

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