What’s the best tool to cut round corners or semi circles with wood?

What’s the best tool to cut round corners or semi circles with wood?
I’m new to this carpentering thing but I’m gonna give it a shot. My main concern is cutting round or circular end or edges. I heard of a jigsaw knife but is there something better? Also do you just paint wood or do you have to put a finish on it first? All comments will help thanks everyone.

Suggestion by KTB
A Coping Saw. I will Guarantee it or I am dirt.

As for paint or sealer, as me about the wood you are using and I can answer the question best I can. for you.

Suggestion by acres12
not entirely sure what you are asking ,

to round the square corners of a flat piece of wood looking down at it – jig saw, or sander

the actual edge top and bottom -router or sander

paint wood indoors or outdoors good practice to prime first then paint, exterior more important to prime, indoors not so much, priming helps help keep no. of coats down, Kilz primer or similar , water based

Suggestion by Lee R
Mark your corners with a lid of the size you want, or a compass would be better. Cut outside the line with a Saber Saw and then sand to the line with a sander, or sanding block and sand paper. If you’re talking about the edges, if you want a large radius, you have to use a router. to just take the sharp edge of, use sand paper.

See the previous answer for painting.

Suggestion by The Vigilante Man
A jig saw will work fine. Depending on the wood and the thickness, you might be able to get an attachment for a Dremel or other “Roto” type tool.

If the piece of wood is small enough you can handle it, you can use a scroll saw or a band saw. Mark the lines and cut just outside then finalize with a sander.

Practise with a scrap piece of wood first if you’ve never used any of these tools.

What is better than a utility knife, to cut a Berber carpet?
We are using a utility knife for after a flood in a basement over concrete. And its a pain and it stinks for while we are doing it. No, we don’t want to hire professionals to remove it.
Is there a better DYI way to cut it? It smells like mold/wet dog. Plus is heavier then dry carpet, so we need to cut many times, into smaller then average pieces. A small circular saw?? Thanks
Supi: Cute… but I’m serious. And asked an honest question.

Suggestion by Supa
I point my finger at the site to be cut, chant loudly, turn in a circle three times and when I open my eyes…it’s cut!!

A circular saw on concrete!!! WTF? I hope that you don’t have kids…

Hire a professional before you hurt yourself or whomever is helping you…

Suggestion by mr.obvious
Yes, go to the hardware store and ask for a hawk bill carpet knife, its a broad knife that hooks over at the end, the do make razor blade hawk bills that will fit in your utility knife, just be careful, always know where you other hand is when you are cutting, pick up some good work gloves and twine , inviting some help over and buy pizza to make the job easier,

Suggestion by Aaron A
haha circular saw, hey what ever works, is close by and handy, its not like its got to be pretty. you’ll definitely need a new blade after wards. It might spay a little but it should do a quick job of it. Other wise use a carpet/linoleum knife.

Suggestion by RavenSpeaks
Make a starter cut with a utility knife, and then try
to tear the carpet into a long strip. Some carpets
will tear like this quite easy.This will save you a lot
of time and cutting.