Quadrilaterals
Important Points to remember
Based on Class 9 NCERT Chapter on QuadrilateralsSimple Classification of Quadrilaterals. For detailed version check at wikipedia |
① A simple closed figure bounded by four line segments is called quadrilateral.
② The sum of (interior) angles of a quadrilateral is 360°- Angle Sum Property of Quadrilateral
③ A quadrilateral in which one pair of opposite sides is parallel is called trapezium.
④ A quadrilateral in which both pairs of opposite sides are parallel is called parallelogram.
⑤ If one of the angles of a parallelogram is right angle then it is a rectangle.
⑥ If all sides of a quadrilateral are equal then it is called rhombus.