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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°?