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angle acb and acd - linear pair angle( sum is 180°
if acd- 125°
then acd + acb = 180°
acb = 180° - 125°= 55°
in triangle -
angle a°+ angle b°+ angle c°= 180°
put the value-
90°+ angle b° + 55° = 180°
angle b°= 180° - 145° = 35°
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