Question

Can someone help me please , and explain how they got this?

Answer 1

Because the line is flat it is 180° but since you already have one angle, 128°, you would just simply have to subtract 128 from 180 to get 52°. Your answer is 52°.

Hope this helped! ;)

Answer 2

a straight line in an angle is a supplementary angle which is equal to 180 degrees. Since 128 is given, you subtract the two numbers so your answer will be 52 degrees