1. write down about adjacent angle 2. find value of `b'
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2b + (40° + 44° + 20° ) = 180
=> 2b + 104°=180°
=> 2b = 180° — 104°
=> 2b = 76
=> b = 76/2 = 38°.
- How 180° is coming???
== ( as., it is on the straight line )
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