# Notes Class 9 Mathematics Chapter 11 Constructions

Please refer to Constructions Class 9 Mathematics Notes and important questions below. The Class 9 Mathematics Chapter wise notes have been prepared based on the latest syllabus issued for the current academic year by CBSE. Students should revise these notes and go through important Class 9 Mathematics examination questions given below to obtain better marks in exams

## Constructions Class 9 Mathematics Notes and Questions

The below Class 9 Constructions notes have been designed by expert Mathematics teachers. These will help you a lot to understand all the important topics given in your NCERT Class 9 Mathematics textbook.

Refer to Chapter 11 Constructions Notes below which have been designed as per the latest syllabus issued by CBSE and will be very useful for upcoming examinations to help clear your concepts and get better marks in examinations.

• Basic Constructions
• Some Constructions of Triangles

(1) Use only ruler and compass while drawing constructions.
(2) Protractor may be used for drawing non-standard angles.
(3) Constructions of a triangle given its base, a base angle and the difference of the other two sides.
(4) Constructions of a triangle given its perimeter and its two base angles.
(5) A triangle can be constructed if its perimeter and two base angles are given.
(6) Geometrical construction is the process of drawing a geometrical figure using only two instruments-an ungraduated ruler and a pair of compasses.
(7) Some specific angles like 15°,30°,45°,60°,75°,90° , etc. can be constructed without using protractor.
(8) A triangle can be constructed if its base, base angle and the sum of the two sides or the difference of the other two sides are given.