geometry - help study for final (secant line and circle)

[missa0312]

Suppose a secant line L intersects a circle at points A and B, and another secant M intersects the same circle at points C and D. Futher suppose that L and M are parallel. Show that AC=BD. (Note: there are 2 possible configurations here.)

 

[Hockeyman]

What are AC and BD? Are they arcs? Not sure what you mean.

 

[tkhunny]

...here.

 

[missa0312]

AC and BD are diagonals.

 

[happy]

AC and BD are diagonals.

Don't flood the board without SHOWING any work.