Heron's Formula — Formula Sheet
Karnataka Board · Class 9 · Mathematics
4 formulas from Heron's Formula (Karnataka Board Class 9 Mathematics) on one page, grouped by topic. Includes The formula is and Right triangle.
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Formulas and Key Relations
Understanding Heron's Formula
The formula is
Area = √[s(s-a)(s-b)(s-c)] where s is the semi-perimeter
Semi-perimeter s = (a+b+c)/2, where a, b, c are the three sides
Special Cases and Problem Types
Right triangle
One angle = 90°, satisfies Pythagoras theorem
Key relations
Semi-perimeter is half of the triangle's perimeter, calculated as s = (a+b+c)/2.
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Sources & Official References
- Karnataka SSLC — kseeb.kar.nic.in
- Dept of Pre-University Education, Karnataka
- National Education Policy 2020 — education.gov.in
Content is aligned to the official syllabus. Refer to the board website for the latest curriculum.
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