Class 9th Math Constructions NCERT Notes CBSE 2023
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Constructions Class 9 Notes

Constructions Class 9 Notes

Chapter 11 Constructions

Chapter 11 of NCERT Class 9 Maths, Constructions is an important chapter that students must check out for proper preparation. To prepare students for the exam, we have provided NCERT notes for Grade 9 Math Chapter 11.

Notes are prepared according to the latest curriculum and guidelines. Students can download the NCERT notes for 9th Grade Math Chapter 11 in PDF format. Vidyakul subject matter experts prepare based on the CBSE curriculum. Scroll down to learn more about NCERT Math notes for 9th Grade, Chapter 11.


Points to Remember

We have provided some important points to remember from 9th NCERT Maths Chapter 11 for students to refer to for exam preparations:

  • A geometrical construction is a process of drawing geometrical figures using geometrical instruments like a ruler, compass, etc.

  • We have constructed the following geometrical figures along with their justifications (Logical proofs):

    • To bisect a given angle.

    • To draw the perpendicular bisector of a given line segment.

    • To construct an angle of 30°, 45°, 60°, etc.

    • To construct a triangle given its base, a base angle, and the sum of the other two sides.

    • To construct a triangle given its base, a base angle, and the difference between the other two sides.

    • To construct a triangle given its perimeter and its two base angles.

Topics and Sub-topics

Geometric construction is the process of drawing geometric shapes using only two objects: a ruler and a compass. This chapter has a practical focus. Here, students learn how to draw two lines from different angles using a tool. Moving forward also draws a triangle with the given base length, side length, and base angle. After all, you can draw the bisector of a given line segment, construct an angle of 60°, construct a triangle by knowing the base and base angle, and the sum of the other two sides, and construct a triangle. Based on the base, the angle at the base, and the difference between the other two sides, create a triangle along the perimeter and two edges at the base.

This chapter will take a lot of practice. With more practice, students will find it easy to answer all the questions in this chapter with perfect accuracy. Before getting into the details, let us take a look at the list of topics covered in the NCERT Class 9 Maths Chapter 11:

Exercise No

Topic Name


Basic Constructions


Constructions of Triangles


Learn More about the same in Constructions Class 9 Notes PDF.

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Constructions Class 9 Maths Notes Part - 1