Special Type of Quadrilaterals — Formula Sheet
ICSE · Class 8 · Mathematics
9 formulas from Special Type of Quadrilaterals (ICSE Class 8 Mathematics) on one page, grouped by topic. Part of the ICSE Class 8 Mathematics syllabus.
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Formulas and Key Relations
1. Quadrilateral Basics
∠A + ∠B + ∠C + ∠D = 360°
Angle sum of a quadrilateral = 360°
2. Trapezium and Isosceles Trapezium
∠A + ∠D = 180°
∠B + ∠C = 180°
3. Parallelogram
Parallelogram perimeter with ratio sides: 2(5x + 3x) = 96
∠A + ∠B = 180°
OA = OC and OB = OD
4. Rectangle
Each angle = 90°
AC = BD
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