1. Area of a Triangle
These two triangles are identical

2. Area of a Triangle
These two triangles are identical

3. Area of a Triangle
These two triangles are identical

4. Area of a Triangle
These two triangles are identical

5. Area of a Triangle
These two triangles are identical

6. Area of a Triangle
These two triangles are identical

7. Area of a Triangle
These two triangles are identical

8. Area of a Triangle
These two triangles are identical

9. Area of a Triangle Together they make a rectangle.
The area of each triangle is half of the area of the rectangle.
This gives us a formula for
the area of a triangle.
Area = ½ base X height

10. Area of a Triangle Example Find the area of a triangle with base 4 cm
and height 5 cm 5
Area = ½ base X height 4
Area = ½ x4 x 5
Area = ½ x 20
Area = 10 cm²

11. Area of a Triangle Example Find the area of a triangle with base 5 cm
and height 12 cm 12
Area = ½ base X height 5
Area = ½ x 5 x 12
Area = ½ x 60
Area = 30 cm²