Question

Two coplanar lines that are perpendicular to the same line are parallel.

a) always
b) sometimes
c) never

Answer 1

Coplanar lines are those lines which lie on the same plane. if coplanar lines are perpendicular to the same line then they are always parallel. this is because coplanar lines lie on the same planeand if they are perpendicular to each other then they must be parallel or in antiparallel sense.