Define perpendicular lines. a. lines that cut across two or more lines. b. two non–coplanar lines that do not intersect. c. two coplanar lines that do not intersect. d. two coplanar lines that intersect at a 90 degree angle.

It is D. Perpendicular lines intersect at a 90 degree angle.

Step-by-step explanation:

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the answer is d

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