Hello, dannyc!
Code:r / p K / * o * / a * / * / J o / * / * / b o / L * * q
Let: .
We have: .
Hence: .
Since is a positive angle: .
Therefore: .
In the figure below, transversal crosses both and , and angle and are measures of the indicated angles, both between and . Lines and will cross somewhere to the left of transversal (that is, on the side opposite the indicated angles).
Question: Why is a true relationship between and for all possible positions of transversal ?