To calculate the area of a triangle use the formula:

Area = One half multiplied by the base multiplied by the height (A=1/2 x bh)

- Squaring the Triangle (Interactive by Shodor)
- Area of Triangles by ABC Splash (Triangles with a right angle)
- Area of Triangles by ABC Splash (Choose your triangles)
- Area of a Triangle by ABC Splash (Triangles without vertical or horizontal sides)