Official NCERT Book for Class 9 Mathematics: Chapter 08 Quadrilaterals
Access the official NCERT textbook for Class 9 Mathematics, updated for the 2026-27 academic session. This digital resource provides the foundational knowledge required for exam success and conceptual clarity.
Chapter-wise Study Material: Chapter 08 Quadrilaterals
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(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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Official NCERT Textbook PDF: Class 9 Mathematics Chapter 08 Quadrilaterals
Chapter Textbook PDF for Class 9 Mathematics
Secure your copy of the NCERT Textbook for Class 9 Mathematics Chapter 08 Quadrilaterals. Widely adopted across educational institutions, final question papers map directly to the framework outlined in this chapter.
Digital E-Book Collection for Class 9 Mathematics
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Complete Your Chapter Preparation
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