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Ex 11.1, 5

Construct an equilateral triangle, given its side and justify the construction.

Let equilateral triangle be ABC

  1. Draw AB = 5 cm
  2. Taking A and B as centers, radius = AB = 5 cm, draw two two arcs intersecting each other at A
  3. Join AB and AC

Thus Δ ABC is our required triangle


By construction,

  AC = BC = AB

∴ ∆ABC is an equilateral triangle.

Thus, the Construction is justified.


  1. Chapter 11 Class 9 Constructions
  2. Concept wise
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CA Maninder Singh
CA Maninder Singh is a Chartered Accountant for the past 7 years. He provides courses for Practical Accounts, Taxation and Efiling at teachoo.com .