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In the straightedge and compass construction of the perpendicular line

below, how do you know that AB | CD?


OA. The angles at the intersection of the two lines can be proven to be
congruent, so they meet at a right angle and the lines are
perpendicular.
B. The angles at the intersection of the two lines can be proven to be
congruent and supplementary, so they meet at a right angle and
the lines are perpendicular.
C. The angles at the intersection of the two lines can be proven to be
supplementary, so they meet at a right angle and the lines are
perpendicular.
D. The angles at the intersection of the two lines can be proven to be
congruent and complementary, so they meet at a right angle and
the lines are perpendicular.

In the straightedge and compass construction of the perpendicular line below, how-example-1
User Davis
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1 Answer

4 votes
A. The angles at the intersection of the two lines can be proven to be congruent, so they meet at a right angle and the lines are perpendicular.
User Ligaoren
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