Check sibling questions
Chapter 5 Class 9 Introduction to Euclid's Geometry
Serial order wise

Ex 5.2, 2 - Does Euclid's fifth postulate imply existence - Postulates

Ex 5.2, 2 - Chapter 5 Class 9 Introduction to Euclid's Geometry - Part 2

Learn in your speed, with individual attention - Teachoo Maths 1-on-1 Class


Question 2 Does Euclid s fifth postulate imply the existence of parallel lines? Explain. Postulate 5 : If a straight line falling on two straight lines makes the interior angles on the same side of it taken together less than two right angles, then the two straight lines, if produced indefinitely, meet on that side on which the sum of angles is less than two right angle If a straight line PQ falls on two straight lines AB & CD such that 1 + 2 = 180 & 1 = 90 , 2 = 90 Then lines AB & CD wont meet, So, lines AB & CD are parallel.

Ask a doubt
Davneet Singh's photo - Co-founder, Teachoo

Made by

Davneet Singh

Davneet Singh has done his B.Tech from Indian Institute of Technology, Kanpur. He has been teaching from the past 13 years. He provides courses for Maths, Science, Social Science, Physics, Chemistry, Computer Science at Teachoo.