in the adjoining figure, AOB is a straight line if a=40°, find the value of b
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Given : AOB is a straight line
a = 40°
To Find : Value of b
Solution:
AOB is a straight line
=> 5b + 2a = 180°
a = 40°
=> 5b + 2(40°) = 180°
=> 5b + 80° = 180°
=> 5b = 100°
=> b = 20°
Hence the vale of b is 20°
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