# Quadrilaterals class 9 Notes Mathematics

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## CBSE Guide Quadrilaterals class 9 Notes

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## 9 Mathematics notes Chapter 8 Quadrilaterals

CBSE Class 09 Mathematics
Revision Notes
CHAPTER 8

• Angle Sum Property of a Quadrilaterals
• Types of Quadrilaterals
• Properties of a Parallelogram
• The Mid-point Theorem
1. Sum of the  all angles of a quadrilateral is ${360^o}$
2. A diagonals of a parallelogram divides it into two congruent triangles.
3. In a parallelogram
• diagonals bisects each other.
• opposite angles are equal.
• opposite sides are equal

(4) Diagonals of a square bisects each other at right angles and are equal, and vice-versa.
(5) A line through the mid-point of a side of a triangle parallel to another side bisects the third side. (Mid point theorem)
(6)The line segment joining the mid-points of two sides of a triangle is parallel to the third side and equal to half the third side.
(7) In a parallelogram, the bisectors of any two consecutive angles intersect at right angle.
(8) If a diagonal of a parallelogram bisect one of the angles of a parallelogram it also bisects the second angle.
(9) The angle bisectors of a parallelogram form a rectangle.
(10) Each of the four angles of a rectangle is right angle.
(11) The diagonals of a rhombus are perpendicular to each other.

## Quadrilaterals class 9 Notes

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• Quick revision notes for CBSE board exams

## CBSE Class-9 Revision Notes and Key Points

Quadrilaterals class 9 Notes. CBSE quick revision note for Class-9 Mathematics, Chemistry, Maths, Biology and other subject are very helpful to revise the whole syllabus during exam days. The revision notes covers all important formulas and concepts given in the chapter. Even if you wish to have an overview of a chapter, quick revision notes are here to do if for you. These notes will certainly save your time during stressful exam days.

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