Class IX Mathematics
Chapter 10: Heron's Formula
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Syllabus Sections
Key Formulas & Equations
Click Copy to duplicateSemi-perimeter
s = \frac{a+b+c}{2}
Half the perimeter of a triangle.
Heron's Formula
A = \sqrt{s(s-a)(s-b)(s-c)}
Calculates triangle area using semi-perimeter s and sides a, b, c.
Related Formulas from Adjacent Chapters
Volume of Sphere
V = \frac{4}{3}\pi r^3
[From Surface Areas and Volumes] Volume capacity of sphere.
Surface Area of Sphere
A = 4\pi r^2
[From Surface Areas and Volumes] Total outer surface area of sphere.
Volume of Cone
V = \frac{1}{3}\pi r^2 h
[From Surface Areas and Volumes] Volume of right circular cone.