CHAPTER 6 LINES AND ANGLES

Submitted by superadmin on 8 November, 2023 - 19:52

Screen Readable NCERT Class 9 Mathematics - 2018 Textbook for Blind Students.

This chapter is planned, organized and described by professor T K Bansal on September 27, 2023, for visually impaired students . All efforts have been made to make the chapter fully accessible by providing headings, alt text and tables. The chapter has been so designed that the students should enjoy reading this chapter and should move forward without any difficulties. The chapter has been checked, word by word and letter by letter for mistakes, still if you find any mistakes or have any suggestions to make the chapter better, please write to us at blind2visionary@gmail.com ‘. Your efforts will be highly appreciated.

Table of Symbols used in this chapter.

Symbol Known As Used For looks like
∥ Parallel to Parallel to 2 vertical lines
Δ Delta To represent a Triangle A small triangle with vertex at top
⊥ Up tag Perpendicular to A small horizontal line with a small vertical line standing on it
∠ Angle Angle A small horizontal line with a tilted line joined to it on left making an angle of 45°
∶ Ratio Ratio 2 dots one above the other, as in in :
∵ Because Because One dot below a two dots in a horizontal line.
∴ Therefore Therefore One dot above two dots in a horizontal line.