This question was asked in Ex 7.4, 5

How the 1and2 conditions were made

Manoj kumar Bhardwaj

Dec. 2, 2017, 6:19 p.m.

Answers!

Jason D'mello

Dec. 9, 2017, 2:47 p.m.

The first and second conditions were made due to exterior angle property.

Exterior angle property states that-

exterior angle=sum of the two opposite angles away fr from the angle adjacent to the exterior angles

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