Learn about the area of triangles with this BBC Bitesize Maths article. For students between the ages of 11 and 14.

To calculate the area of an equilateral triangle, use the formula below: Area of An Equilateral Triangle = (√3)/4 × side2 Area of An Isosceles Triangle Area of an isosceles triangle = ¼ b√4a2-b2 ...

S. L. Green, 756. The Relation between the Area of a Triangle and That of the Equilateral Triangle into Which It Can Be Orthogonally Projected, The Mathematical Gazette, Vol. 12, No. 175 (Mar., 1925), ...