Thread: Parallel Lines
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Styx
#3
May1-07, 03:10 PM
P: 27
I rewrote my proof as:

AB and CD are parallel and M and N are the midpoints of AD and BC (given hypothesis).

Draw a perpendicular line from point B to line DC.
Draw a perpendicular line from point A to line DC.
Label them points O and P.
Since AO and BP are both perpendicular lines between the same two parallel lines AO = BP

Mark the midpoint of AO and BP, label them Q and R
Both points Q and R fall on line MN
Therefore, MN is parallel to AB and CD