Triangles and Special Lines
By S Bay
Directions and/or Common Information:
In each figure, solve for the unknown variable. Upper case letters represent unknown angles, while lower care letters represent unknown lengths.


Note: This is a regular polygon.



Directions and/or Common Information:
Answer each of the following questions with either: always, sometimes, or never.
Two parallel lines are __________ coplanar.
Two skew lines are ___________ coplanar.
Opposite rays ____________ form a line.
Two lines in the same plane are _____________ parallel.
Two planes that do not intersect are ___________ parallel.