I'm Up and Down, and Round and Round
CBSE · Class 9 · Mathematics
All formulas from I'm Up and Down, and Round and Round in CBSE Class 9 Mathematics. Key equations, constants, and identities for board exam preparation.
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Formulas
4. Midpoint, Perpendicular, and Distance of Chords
Chord length from radius and perpendicular distance: 2√(r² - d²)
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Sources & Official References
- NCERT Official — ncert.nic.in
- CBSE Academic — cbseacademic.nic.in
- CBSE Official — cbse.gov.in
- 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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