Quadrilaterals
CBSE · Class 8 · Mathematics
All formulas from Quadrilaterals in CBSE Class 8 Mathematics. Key equations, constants, and identities for board exam preparation.
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Formulas
Rectangle and Square Properties
AC = BD
OA = OC and OB = OD
All angles = 90°
Square diagonals are equal and bisect each other at 90°
In a square, ∠1 + ∠3 + 90 = 180, with ∠1 = ∠3 ⟹ ∠1 = ∠3 = 45°
Angles in a Quadrilateral
∠1 + ∠2 + ∠3 + ∠4 + ∠5 + ∠6 = 180° + 180° = 360°
The sum of all angles in any quadrilateral is 360°.
Parallelogram and Trapezium
Property 4: The diagonals of a parallelogram bisect each other.
∠S + ∠P = 180° and ∠R + ∠Q = 180°
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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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