# Heron’s Formula : CBSE Class 9 Chapter 12

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Before proceeding to Heron’s formula let us recall the following formulas.

Geometric Shapes | Perimeter | Area |

Triangle | ||

Rectangle | ||

Square | ||

Trapezium/Trapezoid | ||

Parallelogram | ||

Circle | (known as circumference) |

Watch the above table, If we want to find the area of a triangle whose base and height is known to us then the formula is . But if we want to find the area of a scalene triangle, then we can find it easily using **Heron’s formula**.

According to **Heron’s formula**, Area of a triangle = , where **a,b,c** are three sides of the triangle and **s** is the semi-perimeter or half-perimeter of the triangle.

Heron’s Formula can also be used to find area of a quadrilateral if sides and one diagonal are given. First divide the quadrilateral into two triangles, find their area using Heron’s formula and again add them.

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