Question

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Answer 1

Answer:

a=105°,b=20°,c=35°

properties:-

1. exterior angle of a triangle
2. parallelogram properties
3. sum of all angles of a triangle

Answer 2

Answer:

Angle a = 105°, b= 35°, c=40°

Step-by-step explanation:

Angle b = Angle CDA = 35° (alternate angles in parallelogram are equal)

Angle CBA = 180-75° = 105°

Angle a = Angle CBA = 105° (alternate angles in parallelogram are equal)

In ∆ABC,

By Angle sum property,

Angle c + Angle b + Angle CBA = 180°

Angle c+ 105 +35 = 180

Angle c = 180-140 = 40°