NCERT Exemplar for Class 9, Maths Chapter 8

NCERT Exemplar Class 9 Maths Chapter 8: Quadrilaterals. NCERT Exemplar Solutions for Class 9 Maths Chapter 8 Quadrilaterals prepare students for their Class 9 exams thoroughly.

Maths problems and solutions for the Class 9 pdf are provided here which are similar to the questions being asked in the previous year’s board.

Contents

1 NCERT Exemplar Class 9 Maths Chapter 8: Quadrilaterals

NCERT Exemplar Class 9 Maths Chapter 8: Quadrilaterals

Class 9: Maths Chapter 8 solutions. Complete Class 9 Maths Chapter 8 Notes.

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 360 degree.
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.
A line drawn through the mid-point of a side of a triangle parallel to another side bisects
the third side,
The quadrilateral formed by joining the mid-points of the sides of a quadrilateral,
taken in order, is a parallelogram.