Geometry
To understand the relation between geometry and architecture, you must first understand the definition of geometry and geometric concepts.
In simple terms, geometry is a branch of math that studies shapes. Everyone, including you has used geometry at some point of your life.
For example:
If you construct an airplane model, your are using geometry.
Geometric concepts are ideas that exist in geometry.
For example:The idea that a dot is an infinitely small point is a geometric concept