NCERT Solutions for Class 9 Maths Chapter 8 Quadrilaterals

The chapter has the core concepts of Quadrilaterals, which are the figures formed by joining four points. Illustrations and examples have been provided to depict the quadrilateral shapes. Certain measurements describe the measurement of a partial quadrilateral. Certain parameters describe the difference between the shapes of quadrilaterals. Further, the chapter highlights the angle sum property of a quadrilateral and properties of a parallelogram with two congruent angles. A parallelogram is formed when the diagonals of quadrilaterals intersect with each other. Various shapes such as rhombus and rectangle intersect with certain points to form angles, and then the chapter ends with briefing out the line-segment and parallel line properties.

• The chapter begins with the introduction and need of quadrilateral through illustrations.
• A quadrilateral has four sides, four angles, and four vertices.
• Parallelograms are formed when the opposite sides of a quadrilateral are the same.
• Further, the rectangle is formed by the bisectors of a parallelogram.
• Many of the shapes such as rhombus, square, trapezium, and parallelograms are interrelated with each other.
• Various conditions for a quadrilateral to be a parallelogram have been described.
• The Mid-point Theorem states that -The line segment in a triangle that joins the mid-point of two sides of a triangle is considered to be parallel to its third and half of the length of the third side.

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