Lines and Angles – Notes
Introduction to Lines and Angles
Line Segment: A line with two end Points
Ray: a line with one end point.
Collinear points: If three or more points lie on the same line they are collinear.
Angle: The figure formed by two rays having a common end point.
Acute Angle: An angle whose measure is more than 00 and less than 900.
Right Angle: An angle whose measure is equal to 900.
Obtuse Angle: An angle whose measure is more than 900 and less than 1800.
Straight Angle: An angle whose measure is equal to 1800.
Reflex Angle: An angle whose measure is more than 1800 and less than 3600.
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CBSE Class 9th Maths 6 - Lines and Angles - Notes
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