Lines and Angles
Class 9 · Mathematics · 5 lessons
Introduction to Lines and Angles
Basic terms of geometry, intersecting lines and concurrent lines.
Exercise 4.1 — Lines and Angles Basics
Simple problems based on lines and angles.
Exercise 4.2 — Pairs of Angles
Pairs of angles and angles in intersecting lines.
Exercise 4.3 — Parallel Lines
Lines and a transversal, lines parallel to the same line.
Exercise 4.4 — Angle Sum of Triangle
Angle sum property of a triangle.