When using a circular saw?? hubby has a cordless 18volt black and decker circular saw and he...

hubby has a cordless 18volt black and decker circular saw and he say you can't cut round edges without adjectives the excess off first. we made a oval table top. it be rectangular, but he cut it off surrounded by sections to build the curve, then used his reciproction saw to variety the final curve cut. did he do this right, or i say , he could enjoy just used the saw and gone straight around the curve. am i wrong or is he right?
Is this mold (pic included) within my shower....
Answers:    A circular saw cuts straight lines best. That's because the blade sits surrounded by the kerf - the space where the blade cut out textile - and the edges on either side of the blade rub against the blade. It's sort of approaching sticking a ruler between the pages of a book, right up against the inside of the spine. It's blocked on both sides, and can't move much.

You *can* cut a slight curve near it, but it's harder on the blade. A reciprocating saw would work better, but might not start out a nice square edge, depending on the generous he used.

There are circular saw blades made to cut curved lines. The blade is sort of triangular shaped, as if you sliced off factor of the outside edge of the blade on 3 sides. There are still teeth vanished on the remaining outside edges.

You can also set the depth of cut to just only just cut through the material, but it still is complicated on the blade, and you end up beside a lot of sawdust.
Can I use a sink that's different from...
You're both right...sort of. You can cut curves next to a circular saw, but not very tight ones. The problem is that the diameter of the blade limitations the radius of the cut. You can't cut a sharp corner with a 8" circular saw blade but near a 1/2" reciprocating saw, you can.