Final answer:
In multiview orthographic drawings, a horizontal surface appears as a line in the front view, representing the length without showing depth.
Step-by-step explanation:
A horizontal surface of a multiview drawing will appear as a line in the front view. In multiview orthographic drawings, different views represent the dimensions of an object. A horizontal plane, when viewed from the front, will not show its depth, thus appearing only as a line. For example, the top surface of a table depicted in a multiview drawing would appear as a line when viewed from the front, which represents the length of the table but not its width or thickness.