Creating a hemisphere shape?

Painter 2020

OS: Windows 10

I have been working with shapes for years now and can do some awesome stuff with them. But in all that time (what 10+ years omg) I have yet to figure out how to create a true clean hemisphere shape. I have tried compounding a circle and a square which creates a clean-cut hemisphere but it can't be separated out from the compound. I have created a circle and deleted opposing anchors but the corners end up rounded. I have drawn a line shape and tried to Bezier the line into a semicircle but the bezier won't form a semicircle without multiple anchors which end up somewhat irregular. The web has been of no help. Anyone out there that has solved this? I would really appreciate hearing from you.

Calvin De Beverly