Understanding Quadrilaterals Class 8 Notes Mathematics

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CBSE Class 8 Revision Notes Maths Understanding Quadrilaterals

• Parallelogram: A quadrilateral with each pair of opposite sides parallel.
(1) Opposite sides are equal.
(2) Opposite angles are equal.
(3) Diagonals bisect one another.
• Rhombus: A parallelogram with sides of equal length.
(1) All the properties of a parallelogram.
(2) Diagonals are perpendicular to each other.
• Rectangle: A parallelogram with a right angle.
(1) All the properties of a parallelogram.
(2) Each of the angles is a right angle.
(3) Diagonals are equal.
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• Square: A rectangle with sides of equal length.
(1)  All the properties of a parallelogram, rhombus and a rectangle.
• Kite: A quadrilateral with exactly two pairs of equal consecutive sides
(1) The diagonals are perpendicular to one another
(2) One of the diagonals bisects the other.
(3) In the figure  but .
• Trapezium: A quadrilateral having exactly one pair of parallel sides.
• Diagonal: A simple closed curve made up of only line segments. A line segment connecting two non-consecutive vertices of a polygon is called diagonal.
• Convex: The measure of each angle is less than .
• Concave: The measure of at least one angle is more than
• Quadrilateral: Polygon having four sides.