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Published byJustine Hopkinson Modified over 2 years ago

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Area of triangles

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What’s the area of this rectangle? 10 cm 6 cm 60 cm 2

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What’s the area of the red triangle? 10 cm 6 cm 30 cm 2

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Area of a triangle length height Area = ½ length x height

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What’s the area? 8 cm 4 cm 16 cm 2 ½ of 8 x 4 =

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What’s the area? 8 cm 32 cm 2

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What’s the area? 8 cm 3 cm 12 cm 2

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What’s the area? 14 cm 2 cm 14 cm 2

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What’s the area? 20cm 15cm 150 cm 2

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What’s the area? 20 cm 8 cm 80 cm 2

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What if the triangle doesn’t have a right angle?

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Split it up! 20 cm 4 cm

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Split it up! 20 cm 4 cm 10 cm (½ of 10 x 4) + ( ½ of 10 x 4) = = 40 ½ of 20 x 4= 40

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What’s the area? 10 cm 8 cm 40 cm 2

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