Answer :

Formula Used/Theory:-


Angle sum property


Sum of all angles of triangle is 180°


Exterior angle is equal to sum of interior opposite angles


In Figure (i)


b = 60° + 70° = 130° (Exterior angle property)


c + 60° + 70° = 180° (Angle sum property)


c = 180° - 130° = 50°


b + a + 30° = 180° (Angle sum property)


a + 130° + 30° = 180°


a = 180° - 160° = 20°


In Figure (ii)


b = 60° + 55° = 115° (Exterior angle property)


a + 60° + 55° = 180° (Angle sum property)


a = 180° - 115° = 65°


b + c + 40° = 180° (Angle sum property)


c + 115° + 40° = 180°


c = 180° - 155° = 25°


Result:- In figure (i) a = 20°; b = 130°;c = 50°


In figure (ii) a = 65°; b = 115°;c = 25°


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