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  1. Chapter 5 Class 7 Lines and Angles
  2. Serial order wise
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Ex 5.1, 12 Find the values of the angles x, y, and z in each of the following: (i)Ex 5.1, 12 Find the values of the angles x, y, and z in each of the following: (i)Vertically opposite angles) Vertically opposite angles) And, ∠AOB = ∠COD y = z 125° = z z = 125° Ex 5.1, 12 Find the values of the angles x, y, and z in each of the following: (ii)Lines AD and EC intersect ∴ ∠DOC = ∠AOE z = 40° Now, AD is a line ∠DOE + ∠AOE = 180° y + 40° = 180° y = 180° − 40° y = 140° Also, Lines AD and CE intersect ∠DOE = ∠COA y = ∠COB + ∠BOA 140° = x + 25° 140° − 25° = x 115° = x y = 115°

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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.