Write a paragraph proof of Theorem 3-8: In a plane, if two lines are perpendicular to the same line, then they are parallel to each other. 


party.girl286  Nov 2, 2017

Here's my best shot


r, t are perpendicular to s     given     angle 3 = angle 4  = angle 5 = angle 6    definition of perpendicular lines   .....so angle 3 = angle 6 and by Euclid, Book 1, Proposition 27.....

If a straight line falling on two straight lines makes the alternate angles equal to one another, then the straight lines are parallel to one another.



cool cool cool

CPhill  Nov 2, 2017

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