Mathematics

Heron’s formula

हेरॉन का सूत्र

In this Class 9 Mathematics topic from the chapter “Area and Perimeter,” students learn how to find the area of a triangle when the lengths of all three sides are known. They use the semiperimeter, s = (a + b + c)/2, and apply Heron’s formula, Area = √[s(s − a)(s − b)(s − c)]. The topic also develops careful substitution, square-root evaluation, unit handling, and step-by-step problem-solving through practical numerical examples.