A Parallelogram is given. You draw a line which is parallel to and crosses the sides [tex]AD[math and in and .

Another line which is parallel to crosses the sides and in and . Show that the line that goes through and the line that goes through intersect with the line that goes through in point . When does that happen & when are those 3 lines parallel..

(see attachment).

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Here's how far i've managed to get..

From that we can see:

Now we know when the lines are parallel.. If we get 0 in the denominator then will have an indefinite value -> meaning the lines will never intersect..

ater that i'm lost.. what do i need to do now and how?