Areas of plane figures 2 (All Mathematical Formulae) --By: Vinod Kumar Dhundhara

Any  triangle.  a, b, c – sides;  a – a base;  h – a height;  A, B, C – angles,
                        opposite to sides  a, b, c ;    p = ( a + b + c ) / 2.

 The last expression is known as Heron's  formula.