please tell question no. 8
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The statement "If 2 lines don't intersect, then they are parallel" has contrapositive "If two lines are not parallel, then they intersect".
Given two lines, draw a line crossing both. Since the lines are not parallel, the two angles on one side of the new line must add up to less than 180. Now you can use the parallel postulate to conclude that the two lines meet on that side.
Given two lines, draw a line crossing both. Since the lines are not parallel, the two angles on one side of the new line must add up to less than 180. Now you can use the parallel postulate to conclude that the two lines meet on that side.
Devmlhtra8:
i didn't understand plz explain
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