Define perpendicular lines.
A.
Lines that cut across two or more lines
B.
Two coplanar lines that do not intersect
C.
Two coplanar lines that intersect at a 90-degree angle
D.
Two non-coplanar lines that do not intersect
A.
Lines that cut across two or more lines
B.
Two coplanar lines that do not intersect
C.
Two coplanar lines that intersect at a 90-degree angle
D.
Two non-coplanar lines that do not intersect