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Quadrilaterals

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Area formulae

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Area calculations

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The area of a parallelogram

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The area of a triangle

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The area of a trapezium

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Finding the area of irregular polygons

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Rectangle perimeters

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Hectare forests

1 hectare = 10000 m2

Do each of the forests below cover an area of one hectare? What are the perimeters?

250 m

60 m

200 m

20 m

40 m

100 m

80 m

50 m

25m

25 m75 m

50 m

50 m

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Shapes made from rectangles

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Recognizing formulae

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This Chinese puzzle is made from 7 shape pieces that fit together to make a square with sides of 16 cm.The intersections are all evenly spaced.

What are the areas of the individual shapes?

Tangram