Area of a triangle is calculated generally using the formula 12 × b × h, where b is the base and h is the height(altitude) of the triangle.

Heron’s formula is used to determine the area of a triangle, when the lengths of the three sides are known.

Heron’s formula states that, if a, b and c are the sides of a triangle, then the area of the triangle is equal to s(s - a)(s - b)(s - c), where s is the semi perimeter i.e. half of the perimeter of the triangle and s = (a + b + c)2.
The formula of the area of a triangle given by Heron, is also known as Hero’s formula.

Units of measurement of any plane figure are in square metres, square centimetres, etc.

Area of a quadrilateral whose sides and one diagonal are given, is calculated by dividing the quadrilateral into two triangles and using the Heron’s formula.

Heron's Formula, NCERT Solutions for Class 9th Mathematics, NCERT Revision Notes, CBSE NCERT Solution Online Free.

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