Lines and Angles

Concept Lectures

Session # 1 : Introduction: Definition of Lines and Angles, Vertex and sides of an angle, Interior and Exterior of an Angle

Session # 2 : Different ways of measuring and angle, a) Sexagesimal System, b) Circular Measure, c) Centesimal System

Session # 3 : Degrees, Minutes and Seconds, Concept of Negative Angle, Axioms related to Angles

Session # 4 : Types of Angles: Acute, Right, Obtuse, Straight, Reflex and Complete Angles; Angles measuring more than 360 degrees.

Session # 5 : Complementary Angles, Supplementary Angles and Angle Bisectors

Session # 6 : Solved Example # 01: On Supplementary Angles

Session # 7 : Solved Example # 02: On Supplementary Angles

Session # 8 : Angle Relations: Adjacent angles and Linear Pair

Session # 9 : Linear Pair Theorem: Sum of Angles forming a Linear Pair = 180º

Session # 10: Converse of Linear Pair Theorem: If two adjacent angles sum up to 180º then the non-common arms are opposite to each other.

Session # 11: Sum of angles around a point is 360º