This is an archived article last updated on Nov 23, 2017. The information may be outdated.

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

Last Updated: Nov 23, 2017, 10:05 IST

In this video we will learn the basic terms and definitions of the chapter lines and angles from CBSE Class 9 Mathematics. This lecture by the expert teacher will definitely help you build a strong hold over the basics of lines and angles and proceed to the concepts of this topic more efficiently.

Class 9 Llines & Angles: Baisc Terms and definitions

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 0^o and 90^o.
Right angle: If the measure of an angle is equal to 90^o.
Obtuse Angle: If the measure of an angle lies between 90^o and 180^o.
Straight angle: If the measure of an angle is equal to 180^o.
Reflex angle: If the measure of an angle is greater than 180^o but less than 360^o.

First Published: Nov 23, 2017, 09:56 IST

Get here latest School, CBSE and Govt Jobs notification and articles in English and Hindi for Sarkari Naukari, Sarkari Result and Exam Preparation. Empower your learning journey with Jagran Josh App - Your trusted guide for exams, career, and knowledge! Download Now