Respuesta :

bibt538

Step-by-step explanation:

a = 30 deg [ being vertically opposite angles ]

a+ b + 90deg = 180 deg [ sum of angles of triangle]

or, 30 deg + b + 90 deg = 180 deg

: . b = 60 deg

c + 75 deg = 180 deg [ being linear pair ]

: . c = 105 deg

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