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# Chapter 8 Class 9 Quadrilaterals

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Updated from new NCERT Books - 2023-24

Get solutions of all NCERT Questions, Exercises and Theorems of Chapter 8 Class 9 Quadrilateral free at teachoo. Answers to all questions have been solved in an easy way, with video of each and every question.

In this chapter, we will learn -

• What is a Quadrilateral
• Angle sum property of a quadrilateral
• Different Types of Quadrilateral - Trapezium, Kite, Parallelogram, Rhombus, Rectangle, Square
• Properties of Parallelogram
• Diagonals of a parallelogram divides it into two congruent triangles  - with Proof (Theorem 8.1)
• Opposite sides are equal in a parallelogram, and its converse  - with Proof (Theorem 8.2 and Theorem 8.3)
• Opposite angles are equal in a parallelogram, and its converse  - with Proof (Theorem 8.4 and Theorem 8.5)
• Diagonals of a parallelogram bisect each other, and its converse  - with Proof (Theorem 8.6 and Theorem 8.7)
• A special condition to prove parallelogram - A quadrilateral is a parallelogram if a pair of opposite sides is equal and parallel (Theorem 8.8)
• Mid-point Theorem, and its converse  - with Proof (Theorem 8.9 and Theorem 8.10)

Here, the chapter is divided into 2 parts - Concept Wise, and Serial Order Wise.

In Serial Order Wise, just like the NCERT Book - you can check exercises and examples. This is useful when you want to check a particular question.

In Concept Wise, Teachoo (टीचू) has divided the chapter into different concepts. First the concept is explained, and then the questions of that concept is done - from easy to difficult.

Click on a click below to get started

## Concept wise

What's in it?

Updated from new NCERT Books - 2023-24

Get solutions of all NCERT Questions, Exercises and Theorems of Chapter 8 Class 9 Quadrilateral free at teachoo. Answers to all questions have been solved in an easy way, with video of each and every question.

In this chapter, we will learn -

• What is a Quadrilateral
• Angle sum property of a quadrilateral
• Different Types of Quadrilateral - Trapezium, Kite, Parallelogram, Rhombus, Rectangle, Square
• Properties of Parallelogram
• Diagonals of a parallelogram divides it into two congruent triangles  - with Proof (Theorem 8.1)
• Opposite sides are equal in a parallelogram, and its converse  - with Proof (Theorem 8.2 and Theorem 8.3)
• Opposite angles are equal in a parallelogram, and its converse  - with Proof (Theorem 8.4 and Theorem 8.5)
• Diagonals of a parallelogram bisect each other, and its converse  - with Proof (Theorem 8.6 and Theorem 8.7)
• A special condition to prove parallelogram - A quadrilateral is a parallelogram if a pair of opposite sides is equal and parallel (Theorem 8.8)
• Mid-point Theorem, and its converse  - with Proof (Theorem 8.9 and Theorem 8.10)

Here, the chapter is divided into 2 parts - Concept Wise, and Serial Order Wise.

In Serial Order Wise, just like the NCERT Book - you can check exercises and examples. This is useful when you want to check a particular question.

In Concept Wise, Teachoo (टीचू) has divided the chapter into different concepts. First the concept is explained, and then the questions of that concept is done - from easy to difficult.

Click on a click below to get started