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NCERT Class 9 Mathematics Chapter 8 Quadrilaterals
This chapter in NCERT Book Class 9 Maths Quadrilaterals Questions makes learning easy for Class 9 Mathematics students. Read it carefully. Also, use the NCERT Solutions for Class 9 Mathematics to check answers for all the textbook questions.
Download Chapter 8 Quadrilaterals - NCERT Class 9 Textbook
(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 8 Quadrilaterals
Official NCERT E-Textbook: Chapter 8 Quadrilaterals (NCERT)
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