Chapter 8 · Class 9 CBSE · Formula Sheet

Quadrilaterals Formulas — Class 9 CBSE

Prove angle sum property, properties of parallelograms, and mid-point theorem.

Key Formulas

Angle Sum of Quadrilateral

\angle A + \angle B + \angle C + \angle D = 360°

Parallelogram

\text{Opposite sides are parallel and equal}

Diagonal of Parallelogram

\text{Diagonals bisect each other}

Mid-Point Theorem

\text{Line joining midpoints of two sides is parallel to third side and half its length}

Worked Examples

1Using: Application

Apply the key formula from this topic to a sample problem.

Step 1: Identify the formula.

Step 2: Substitute the values.

Step 3: Simplify to get the answer.

Answer: See solution above

Practice Now

Apply these formulas with 60+ practice questions and AI-powered doubt clearing.

Practice Now

More Class 9 CBSE Formulas

Number SystemsPolynomialsCoordinate GeometryLinear Equations in Two VariablesIntroduction to Euclid's GeometryLines & Angles

Frequently Asked Questions

How many formulas are in Class 9 CBSE Quadrilaterals?+
There are 4 formulas in the Quadrilaterals chapter for Class 9 CBSE. Each formula is essential for solving problems in this topic.
How to remember Quadrilaterals formulas easily?+
Practice regularly with worked examples, group related formulas together, and use SparkEd's interactive practice mode to reinforce your memory through problem-solving.
Are these Quadrilaterals formulas enough for exams?+
Yes, these formulas cover the complete CBSE Class 9 syllabus for Quadrilaterals. Practice applying them to different types of questions for full exam readiness.

Master Quadrilaterals on SparkEd

Go beyond formulas. Practice at three difficulty levels with instant feedback, step-by-step solutions, and an AI coach.

Start Practising Free

SparkEd Maths provides free formula sheets for Class 1-10 across 7 education boards. All formulas are aligned to the 2025-26 syllabus.