Big Ideas Math Geometry, 2014
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Big Ideas Math Geometry, 2014 View details
Chapter Review
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Exercise 1 Page 164

Lines that intersect at a right angle are perpendicular.

MR, LQ, RN, and QP

Practice makes perfect
Perpendicular lines create a 90^(∘) angle, a right angle, at their point of intersection. We can see that each edge in the figure appears to meet at 90^(∘), so the lines perpendicular to QR are all the lines that intersect it. Let's mark them on the diagram.

The lines perpendicular to QR are MR, LQ, RN, and QP.