Looking for a good way to make composite shapes. Say we have a classic tombstone. It's a half-circle on top and a rectangle on the bottom. I have tried doing this by either just burying a disk into a rectangle, or by cutting a disk in half then joining it to a rectangle. It stays 2 different parts, and if I join them together it still kinda sucks.
When I tried to fix the mesh manually it became abundantly clear that there had to be a better way.
Here's the sort of thing I end up with: