How is the ‘trabeate’ principle of architecture different from the arcuate?

Trabeate principle of architecture is different from the arcuate principle in the following way:

1. In the trabeate principle, a horizontal beam is placed across two vertical columns and roofs, doors and windows are made.
2. In the arcuate principle, the bricks are joined in an arch shape on a wooden plank, put on two vertical columns, doors, windows, and roofs, and are made arch-shaped. The weight of the doors and windows is carried by arches. The keystone of the arch transfers the weight on the bases of the arch.