##### 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 0^{0} and less than 90^{0}.

Right Angle: An angle whose measure is equal to 90^{0}.

Obtuse Angle: An angle whose measure is more than 90^{0} and less than 180^{0}.

Straight Angle: An angle whose measure is equal to 180^{0}.

Reflex Angle: An angle whose measure is more than 180^{0} and less than 360^{0}.

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ShikshaHouse

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CBSE Class 9th Maths 6 - Lines and Angles - Notes

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