Quadrilaterals (Chapter 8): Class 9 IX Maths CBSE

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Quadrilaterals (Chapter 8): Class 9 IX Maths CBSE

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A quadrilateral is a closed figure with four straight sides. The sum of all the interior angles of a quadrilateral is 360 degree.
The diagonal splits a parallelogram into 2 triangles which are congruent. Opposite sides and angles of a parallelogram are equal. Also, diagonals of a parallelogram always bisecting each other.

– A quadrilateral is a parallelogram, if either opposite sides or opposite angles are equal or diagonals are bisecting each other or pair of opposite sides are parallel and equal.
– In a rectangle, diagonals are equal and bisect each other and vice-versa.
– In a rhombus, diagonals bisect each other at 90 degree and vice-versa.
– In a square, diagonals are equal and bisect each other at 90 degree and vice-versa.
– In a triangle, the line joining midpoints of any two sides is parallel to the 3rd side and is half of it.

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