Pls answer question 9 quickly I will mark as brainliest

Answer:
80 degrees.
Step-by-step explanation:
THe reason why the 3 angles add up to 180 degrees is because they are the 3 angles in the triangle.
So m APB = 180 - 100
= 80 degrees.
Answer:
in hint bap +abp +apb =180 (being sum of interior angle of triangle )
by using alternate angles ,crrosponding angles you can solved
Step-by-step explanation: