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.