Answer:
a = 20° , b = 160° , c = 125°
Step-by-step explanation:
a and 20° are vertically opposite angles and are congruent , so
a = 20°
b and 20° are a linear pair and sum to 180° , that is
b + 20° = 180° ( subtract 20° from both sides )
b = 160°
20° , 35° and c lie on a straight line and sum to 180° , so
20° + 35° + c = 180°
55° + c = 180° ( subtract 55° from both sides )
c = 125°
