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a + b = 116°. ----------------(1)
a + b + a + b + a + a = 360°
=> 4a + 2b = 360°
=> 2a + b = 180. --------------------(2)
=> b = 180 - 2a
Put in (1)
=> a + 180 - 2a = 116
=> 180 - a = 116
=> a = 180 - 116
=> a = 64°
=> b = 52°
safxtn:
Thank you
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