I want to create an object which is similar to but is not a rainbow ie ever reducing circles inside the main circle (or vice versus starting with a small circle or cylinder.) See image below of the object I want to create.
I tried using a circle and also a cylinder which when complete I would 'cut' in half using boolean.
I tried selecting all the edges (Alt + click on an edge) and then use extrude and also scale which I could not get to work the way I wanted.
What is the method please.
Image of my building with the half circle now included.