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CBSE Class 9: Lines and Angles - Types of Angles

Nov 22, 2017 11:23 IST

    In this video we will learn about:

    • Complementary angles
    • Supplementary angles
    • Adjacent angles
    • Linear Pair
    • Vertically opposite angles
    • Proof for vertically opposite angles being equal
    • Complementary Angle: A pair of angles is said to be complementary if the sum of their measures is equal to 90o and each angle is said to be the complement of the other
    • Supplementary Angle: If the sum of the measures of a pair of angles is equal to 180o, then it is called a supplementary angle
    • Adjacent Angle: Two angles are said to be adjacent if they have a common arm and a common vertex and their non-common arm lies on the opposite sides of the common arm
    • Linear Pair: A pair of adjacent angles is said to be forming linear pairs if the sum of the adjacent angles is equal to 180o, i.e., which is possible only when the non-common arms of the pair of adjacent angles form opposite rays. It is a special case of adjacent angles.
    • Vertically opposite angles are equal

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

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

     

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