Angle A= 40 degrees because all angles in a triangle must add up to 180 degrees if we add 90+50 which are the two numbers in the other 2 corners of the triangle we get 40, to find the difference we subtract 180-140 which equals 40.

Angle B= 110 degrees because angle B is a corresponding angle to 110 degrees which means they are equal to each other. You can recognize corresponding angles because they form an “F” in the line segments.

Angle C= 110 degrees because angle C is a supplementary angle. You can see a supplementary angle when 2 angles are on a flat line separated from a line in between. To find 110, you minus 180-70 which gives you 110.

Angle D= 35 degrees because Angle D is a complementary angle. You can find a complementary angle from when an angle being looked for is on a right angle. To find Angle D you have to minus 90 degrees, by the number it shows you on the other side of the right angle. In this case it would be 90-55 which gives you an answer of 35.