Updated for new NCERT - 2026 Exams Curriculmn
Get NCERT Solutions of all exercise questions and examples of Chapter 10 Class 9 Herons Formula. Answers to all question have been solved in a step-by-step manner, with videos of all questions available.
We have studied that
Area of triangle = 1/2 × Base × Height
In questions where Height and Base is given, we can find the area of triangle easily.
But, in cases where all 3 sides are given, how will we find the area?
If all 3 sides are given, we find Area of Triangle using Herons (or Hero's) Formula
By Hero's Formula
Area of triangle = Square root (s (s-a) (s-b) (s-c))
where a,b, c are sides of the triangle
and s = Semi-Perimeter of Triangle
i.e. s = (a+b+c)/2
In this chapter, we will find Area of Triangle using Herons formula
We will also find Area of Quadrilateral by dividing it into two triangles, and then finding Area of triangle using Hero's Formula
Click on an exercise link or a topic link below to start doing the chapter.