Answer:
J
Explanation:
The sum of all interior angles in a triangle is equal to 180°
So the other unknown angle in the triangle is 180 - (50+38) = 92°
And a straight line has angle 180° as well.
To find angle A, you must minus the unknown angle (now known which is 92°) from 180.
180 - 92 = 88°
A more simplified way is using the formula in the pic.
Exterior angle = sum of opposite interior angles
Angle A = 50+38 = 88
(which J is saying)