Class 9 Maths Heron Formula Introduction


Area is the amount of space inside a boundary of a 2D object. Unit of area is m2, cm2, hectare, acre etc.

Area of a figure is a number in some unit, associated with the part enclosed by the figure.

We know how to find area of Right Triangle, Equilateral Triangle & Isosceles Triangle.


Heron of Egypt gave a formula to find area of ANY triangle. This formula is called Heron’s Formula or Hero’s formula. It is stated as


Where a, b and c are the sides of the triangle, and s = semi-perimeter i.e. half the perimeter of the triangle = (a + b + c)/2.,


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