If two angles are supplementary, that means the sum of their degrees of measure will add up to 180. In order to find the measure of angle B, subtract angle A from 180 like shown:

This gives us a final answer of 43 degrees for angle B.

If two angles are supplementary, that means the sum of their degrees of measure will add up to 180. In order to find the measure of angle B, subtract angle A from 180 like shown:

This gives us a final answer of 74 degrees for angle B.

If two angles are supplementary, that means the sum of their degrees of measure will add up to 180. In order to find the measure of angle B, subtract angle A from 180 like shown:

This gives us a final answer of 146 degrees for angle B.

If two angles are supplementary, that means the sum of their degrees of measure will add up to 180. In order to find the measure of angle B, subtract angle A from 180 like shown:

This gives us a final answer of 38 degrees for angle B.

If two angles are supplementary, that means the sum of their degrees of measure will add up to 180. In order to find the measure of angle B, subtract angle A from 180 like shown:

This gives us a final answer of 157 degrees for angle B.

If two angles are supplementary, that means the sum of their degrees of measure will add up to 180. In order to find the measure of angle B, subtract angle A from 180 like shown:

This gives us a final answer of 18 degrees for angle B.

If two angles are supplementary, that means the sum of their degrees of measure will add up to 180. In order to find the measure of angle B, subtract angle A from 180 like shown:

This gives us a final answer of 22 degrees for angle B.

The name of a ray includes two letters, so  can be eliminated.

The first letter must be the endpoint. Since  is a name of the ray, the endpoint is , and any alternative name for the ray must begin with . This leaves only .

 and  are two acute angles of a right triangle and are therefore complementary - that is, 

, so

 and , being alternate interior angles formed by transversal  across parallel lines, are congruent, so .

We now look at , whose interior angles must have degree measures totaling , so

From the Parallel Postulate and its converse, as well as its various resulting theorems, two lines in a plane crossed by a transversal are parallel if any of the following happen:

Both lines are perpendicular to the same third line - this happens if  is a right angle, since, from this fact and the fact that  is also right, both lines are perpendicular to .

Same-side interior angles are supplementary - this happens if  and  are supplementary, since they are same-side interior angles with respect to transversal .

Alternate interior angles are congruent - this happens if , since they are alternate interior angles with respect to transversal .

However, the fact that   bisects  has no bearing on whether  is true or not, since it does not relate any two angles formed by a transversal. 

"  bisects " is the correct choice.