Question

what word refers to a line that is perpendicular to the surface of a 3d face?
○ invert
○ vertex
○ inset
○ normal

Explanation:

In geometry, a normal is a line perpendicular to a surface. "Invert" is a general - operation term not related to this geometric concept. A "vertex" is a point where edges meet. "Inset" refers to something set in or inserted. The term for a line perpendicular to a 3D face is "normal".

Answer:

D. normal