Lines and Angles
Contents
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
Solved Examples
Session # 6 : Solved Example # 01: Two Problems On Supplementary Angles
Session # 7 : Solved Example # 02: Two Problems On Supplementary Angles
Concept Lectures
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
Solved Examples
Session # 12: Solved Example # 03: On Linear Pairs
Session # 13: Solved Example # 04: On Linear Pairs
Session # 14: Solved Example # 05: On Linear Pairs
Concept Lectures
Session # 15: Vertically Opposite Angles are equal
Solved Examples
Session # 16: Solved Example # 06: On Vertically Opposite Angles
