JJ2014 wrote:
Attachment:
Screen shot 2012-12-09 at 1.40.06 PM.png
In the figure above, QRS is a straight line and QR = PR. Is it true that lines TR and PQ parallel?(1) Length PQ = Length PR
(2) Line TR bisects anglePRS
(1) PQ = PR = QR, it is an equilateral triangle; each angle is 60 degrees. Insufficient
(2) angle PRS = 2 * angle QPS[exterior angle property]
Line TR bisects angle PRS
therefore, angle PRT
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