Answer:
EF, FG, AB and BC are perpendicular to BF.
Step-by-step explanation:
In the figure attached, a rectangular prism has been given.
Line BF is contained in the face BCGF of the prism.
Therefore, all the faces perpendicular to the face given are,
ABFE, EFGH, ABCD and CGHD.
But the line segments contained in these faces and perpendicular to the line segment BF are EF, FG, AB and BC.
Therefore, answer is the line segments EF, FG, AB and BC are perpendicular to BF.
