Ex 5.1

Chapter 5 Class 7 Lines and Angles
Serial order wise

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### Transcript

Ex 5.1, 9 In the adjoining figure: (i) Is ∠1 adjacent to ∠2? Here, ∠1 and ∠2 have a common vertex O, They have a common line OC and There is no overlapping of angles. ∴ They are adjacent angles. Ex 5.1, 9 In the adjoining figure: (ii) Is ∠AOC adjacent to ∠AOE?Here, Angles are overlapping each other. ∴ They are not adjacent angles Ex 5.1, 9 In the adjoining figure: (iii) Do ∠COE and ∠EOD form a linear pairCOE and ∠EOC have Common vertex O Common side OE Their uncommon side COD forms a line ∴ They form a linear pair. Ex 5.1, 9 In the adjoining figure: (iv) Are ∠BOD and ∠DOA supplementary? ∠BOD and ∠DOC have Common vertex O Common side OD Their uncommon side AOB forms a line ∴ They form a linear pair. ∠BOD and ∠DOC have Common vertex O Common side OD Their uncommon side AOB forms a line ∴ They form a linear pair. Ex 5.1, 9 In the adjoining figure: (v) Is ∠1 vertically opposite to ∠4? Here, ∠1 and ∠4 have a common vertex O, are opposite to each other. ∴ Yes, ∠1 is vertically opposite to ∠4 Ex 5.1, 9 In the adjoining figure: (vi) What is the vertically opposite angle of ∠5? Here, Two intersecting lines are AB and CD And angle vertically opposite to ∠ 5 is ∠ BOC ∴ ∠ BOC is vertically opposite to ∠5

#### 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.