Slide46.JPG

Slide47.JPG
Slide48.JPG Slide49.JPG Slide50.JPG Slide51.JPG Slide52.JPG

  1. Chapter 11 Class 9 Constructions
  2. Concept wise
Ask Download

Transcript

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 Ex 11.1, 5 Construct an equilateral triangle, given its side and justify the construction. Let’s assume side of equilateral triangle is 5.5 cm In an equilateral triangle, all sides are equal So, our triangle looks like Let’s construct it Steps of construction 1. Draw a line segment AB of length 5.5 cm 2. Taking 5.5 cm as radius, and A as center, draw an arc. 3. Taking 5.5 cm as radius, and B as center, draw another arc. 3. Taking 5.5 cm as radius, and B as center, draw another arc. Thus, Δ ABC is the required equilateral triangle Justification By construction, AB = AC = BC Since all sides are equal ∴ ∆ABC is an equilateral triangle. Thus, the Construction is justified.

About the Author

Davneet Singh's photo - Teacher, Computer Engineer, Marketer
Davneet Singh
Davneet Singh is a graduate from Indian Institute of Technology, Kanpur. He has been teaching from the past 8 years. He provides courses for Maths and Science at Teachoo. You can check his NCERT Solutions from Class 6 to 12.