Understanding Quadrilateral — Formula Sheet
Gujarat Board · Class 8 · Mathematics
5 formulas from Understanding Quadrilateral (Gujarat Board Class 8 Mathematics) on one page, grouped by topic.
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Formulas and Key Relations
Sum of Exterior Angles of a Polygon
The sum of all exterior angles of ANY polygon (convex) = 360°. This is true regardless of the number of sides.
For a regular polygon
Each exterior angle = 360° ÷ number of sides.
Types of Quadrilaterals
The sum of all interior angles of a quadrilateral = 360°.
Properties of a Parallelogram
PROPERTY 1 (Opposite Sides)
The opposite sides of a parallelogram are equal in length. (AB = DC and AD = BC)
PROPERTY 3 (Adjacent Angles)
The adjacent angles (co-interior angles) in a parallelogram are supplementary, i.e., they add up to 180°. (∠A + ∠B = 180°, ∠B + ∠C = 180°, etc.)
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Sources & Official References
Content is aligned to the official syllabus. Refer to the board website for the latest curriculum.
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