## NCERT Book for Class 9 Mathematics Chapter 8 Quadrilaterals

Class 9 Mathematics students should refer to the following NCERT Book chapter Chapter 8 Quadrilaterals in standard 9. This NCERT Book for Grade 9 Mathematics will be very useful for exams and help you to score good marks

### Chapter 8 Quadrilaterals NCERT Book Class 9

(A) Main Concepts and Results

Sides, Angles and diagonals of a quadrilateral; Different types of quadrilaterals: Trapezium, parallelogram, rectangle, rhombus and square.

• Sum of the angles of a quadrilateral is 360º,

• A diagonal of a parallelogram divides it into two congruent triangles,

• In a parallelogram

(i) opposite angles are equal

(ii) opposite sides are equal

(iii) diagonals bisect each other.

• A quadrilateral is a parallelogram, if

(i) its opposite angles are equal

(ii) its opposite sides are equal

(iii) its diagonals bisect each other

(iv) a pair of opposite sides is equal and parallel.

• Diagonals of a rectangle bisect each other and are equal and vice-versa

• Diagonals of a rhombus bisect each other at right angles and vice-versa

• Diagonals of a square bisect each other at right angles and are equal and vice-versa

• The line-segment joining the mid-points of any two sides of a triangle is parallel to the third side and is half of it.

**Please refer to attached file for NCERT Class 9 Maths Quadrilaterals Questions**

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