Determine which, if any, of the three lines PQ, PR and QR are perpendicular.
?
P (4, 6)
Q (4, 12)
R (10, 6)
?

A. PR and QR are perpendicular.
B. PQ and PR are perpendicular.
C. PQ and QR are perpendicular.
D. None of the lines are perpendicular.

Answer: B

Mathematics

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