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Published byUrsula Roberts Modified over 8 years ago

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The distance around an enclosed shape is called the perimeter. The amount of space enclosed inside a shape is called the area.

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Area of a rectangle base height Area of rectangle = base × height

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Area of a triangle base Area of triangle = ½ × base × height height

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Area of a parallelogram A parallelogram can be made into a rectangle. base height Area of parallelogram = base × height

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Area of a trapezium Two identical trapeziums can be made into a parallelogram. a h Area of parallelogram = ½ (a + b) h b b a

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10 8 Examples 1 Find a the perimeter b the area of the shape. All lengths are in cm. 7 6 10 8 7 6 2 3 a b

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10 cm 3 cm Examples 2 Find the area of the parallelogram.

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6 cm 4 cm Examples 3 Find the area of the triangle.

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Examples 4 Find the area of the trapezium. All lengths are in cm. 5 3 2

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Examples 5 The area of the trapezium is 24 cm 2. Find the value of x. 2x+3 4 cm x

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