Example 1
Express m∠F in terms of m∠Y.
Example 2
Out of the alternate interior angles theorem, the corresponding angles theorem, and the alternate exterior angles theorem, which one is disproved by the parallel postulate?
Example 3
What are the values of m and n?
Example 4
Are lines a and b parallel if p = 13 and q = 54?
Example 5
In what branch of geometry is the parallel postulate false?