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CBSE Class 9: Lines and Angles - Basics Terms and Definition

Nov 23, 2017 09:56 IST

    In this video you will learn about the topics basic terms and definitions of the chapter lines and angles.

    • Collinear Points: Three or more points are said to be collinear, if a line passes through all three points.
    • Ray: Ray is a part of line, which has one the end point and can be extended indefinitely on the other end.
    • When two rays have a common initial point they are said to have formed an angle.
    • The angle is measured in degrees or radians.
    • Acute angle: If the measure of an angle lies between 0o and 90o.
    • Right angle: If the measure of an angle is equal to 90o.
    • Obtuse Angle: If the measure of an angle lies between 90o and 180o.
    • Straight angle: If the measure of an angle is equal to 180o.
    • Reflex angle: If the measure of an angle is greater than 180o but less than 360o.

    CBSE Class 9: Heron’s Formula - Applications of Heron’s Formula

    CBSE Class 9: Lines and Angles - Types of Angles

     

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