As we read the question, we sketched it out here on our yellow pad. We got
100 degrees for angle 'bec', but we have no confidence in that result, because
we're not at all sure that our sketch is the only possible one that fits the details
in the question.
We're pretty sure that this is another case where we really need to see the labeled
drawing described in the question before we can tease out any reliable answer.
never
55 degrees
none of these answers are correct
A = C = 180 - B = 80 So A + C = 160
67 degrees
280
never
160 degrees.
none of these are correct
55 degrees
32 degrees
none of these answers are correct
A = C = 180 - B = 80 So A + C = 160
The following answer is correct only if b is the measure of an angle in degrees. The complement is 90-43 = 47 degrees.
67 degrees
All you have to remember for this question is that opposite angles in a parallelogram are equal. So if you want to find another angle which is 57, just look at the angle directly opposite.
a right angle equals 90 degrees.