Finding coplanar and concentric surfaces

I imported a 3D part from a step file. Addionally I have parameters for the following surfaces:
1. a plane defined by a directional vector and an offset
2. a cylinder surface defined by a positional vector, a directional vector and a radius

I would like to find all faces in my part that are either coplanar to my plane or concentric and equal in radius to my cylinder surface.

My idea was to iterate over all faces and compare their parameters with the plane/cylinder I have.
Is there a better way to do this and if no, how do I iterate over the faces of my part?