Question

1. in the rectangular prism below bc and cf are perpendicular because... they intersect at a 90° angle and are on the same plane. they intersect a 90° angle and are not on the same plane. they do not intersect a 90° angle and are not on the same plane. they do not intersect a 90° angle and are on the same plane.

Explanation:

Step1: Recall perpendicular - line definition

Perpendicular lines intersect at a 90 - degree angle. In a rectangular prism, adjacent edges on the same face are perpendicular. BC and CF are adjacent edges of the face BCFE.

Step2: Analyze the position of BC and CF

BC and CF are on the same face (the right - hand side face BCFE of the rectangular prism) and they intersect at a 90 - degree angle.

Answer:

They intersect at a 90° angle and are on the same plane.