Which synchronous modeling command can be used to merge cylindrical and conical split faces such as hole and boss geometry?

• A. Optimize Face
• B. Merge Faces
• C. Combine Geometry
• D. Enhance Features

Answer: (B)

In synchronous modeling, merging adjacent surface regions is the way to simplify topology when two faces meet along a boundary, such as where a cylindrical hole intersects a conical boss. The Merge Faces command is designed to fuse those neighboring faces into one continuous surface. By turning the split faces into a single face, you remove the seam between the hole wall and the boss surface, making the geometry behave as a unified surface for further edits like fillets, blends, or subsequent feature operations.

This is preferable over other options because those tools are aimed at smoothing or improving surface quality, combining separate geometry, or adjusting features, rather than turning two joined faces into one surface region.