### Home > GC > Chapter 6 > Lesson 6.2.2 > Problem 6-50

6-50.

When do alternate interior angles have equal measures?

If *p* = *h*, then *l* and *m* are parallel.

If two angles which form a straight angle are equal, what must their measures be?

*n* is perpendicular to *m* because *w* and *k* are both 90°.

Under what circumstances are vertical angles equal?

Is there anything special about angles that add up to 160°?