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  1. Chapter 11 Class 9 Constructions
  2. Serial order wise
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Ex 11.1, 5 Construct an equilateral triangle, given its side and justify the construction. Let equilateral triangle be ABC Draw AB = 5 cm Taking A and B as centers, radius = AB = 5 cm, draw two two arcs intersecting each other at A Join AB and AC Thus Δ ABC is our required triangle Justification By construction,   AC = BC = AB ∴ ∆ABC is an equilateral triangle. Thus, the Construction is justified.

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Davneet Singh
Davneet Singh is a graduate from Indian Institute of Technology, Kanpur. He provides courses for Mathematics from Class 9 to 12. You can ask questions here.