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Question
In the adjoining figure, if b° = a° + c°, find b.
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Solution
a° + b° + c° = 180° ............(straight angle)
But b° = a° + c° .........(given)
∴ a° + c° + b° = 180°
⇒ b° + b° = 180°
⇒ 2b° = 180°
⇒ b° =`(180°)/2` = 90°
Hence b° = 90°
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