This question was asked in Ex 8.2, 2

While justifying equation 5 and 6 the reason written is linear pair but it's not the correct reason as linear pair consist of 2 angles and their sum is 180 degree .But here there are 3 angles so the reason should be as it is a straight angle .

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Rashmiranjan Choudhury
Oct. 9, 2019, 2:16 p.m.