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Area of triangles

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**What’s the area of this rectangle?**

10 cm 6 cm 60 cm2

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**What’s the area of the red triangle?**

10 cm 6 cm 30 cm2

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

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What’s the area? 4 cm 8 cm 16 cm2 ½ of 8 x 4 =

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What’s the area? 8 cm 32 cm2 8 cm

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What’s the area? 8 cm 12 cm2 3 cm

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What’s the area? 2 cm 14 cm 14 cm2

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What’s the area? 15cm 20cm 150 cm2

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What’s the area? 20 cm 8 cm 80 cm2

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

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Split it up! 4 cm 20 cm

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

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What’s the area? 10 cm 40 cm2 8 cm

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© Richard A. Medeiros 2004 x y Function Machine Function Machine next.

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