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  1. Chapter 7 Class 7 Congruence of Triangles
  2. Serial order wise
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Ex 7.2, 2 (a) You want to show that ∆ART ≅ ∆PEN, If you have to use SSS criterion, then you need to show (i) AR = (ii) RT = (iii) AT = For SSS criteria, All three sides must be equal Therefore, AR = RT = AT = Ex 7.2, 2 (b) You want to show that ∆ART ≅ ∆PEN, If it is given that ∠T = ∠N and you are to use SAS criterion, you need to have (i) RT = and (ii) PN =For SAS criterion, Two sides and the angle between them are equal. Given, ∠ T = ∠ M So, RT = PN = Ex 7.2, 2 (c) You want to show that ∆ART ≅ ∆PEN, If it is given that AT = PN and you are to use ASA criterion, you need to have (i) ? (ii) ?For ASA criterion, Two angles and the side between them are equal. Given, AT = PN So, ∠A = ∠T =

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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.