Question

How to solve this solution​

Answer 1

Answer:

angle acb =180-80=100(linear pairs)

therefore, for the triangle ABC, 2 angles are known, sum of all angles of a triangle =180

hence, angle b=180-(100+30)=180-130=50

Similarly in triangle ADC, sum of 3 angles =180

2 angles are already given, that is, 80 and 66

then,angle a=180-(80+66)=180-146=34

Answer 2

Answer:

it's 180-250 by 10 to have the solution