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

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Presentation on theme: "Area of triangles. What’s the area of this rectangle? 10 cm 6 cm 60 cm 2."— Presentation transcript:

1 Area of triangles

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

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

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

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

6 What’s the area? 8 cm 32 cm 2

7 What’s the area? 8 cm 3 cm 12 cm 2

8 What’s the area? 14 cm 2 cm 14 cm 2

9 What’s the area? 20cm 15cm 150 cm 2

10 What’s the area? 20 cm 8 cm 80 cm 2

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

12 Split it up! 20 cm 4 cm

13 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

14 What’s the area? 10 cm 8 cm 40 cm 2


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