A sharp one
its not the saw you use-- its the blade-- you want to use a carbide tip diamond blade
Use a diamond blade saw.
I have done it on a scrollsaw.
I use a very fine tooth 'toolbox saw'. This is a short firm saw with twelve small teeth per inch. Makes a very smooth cut in plastics of any kind.
An ordinary cross cut saw like you use to cut wood does the job well.
There are too many variables to know how to answer this. How big a branch do you want to cut? How high are the tree branches? If beyond your reach, do you want to cut the branches while standing on the ground or are you willing to use a ladder? Are you a frail woman or an amazon? The simplest saw for this is a manual saw called a "Pruning Saw." A more versatile saw is an electric chain saw.
Yes, with a stone cutting blade, but it would have to be a blade made to cut while dry and it would be a slow process with lots of dust.
If I was cutting curves in wood, I would use a sabre saw or a keyhole saw.If I was cutting curves in wood, I would use a sabre saw or a keyhole saw.
To cut things.
Slate tile can be easily cut with a hand masonry saw using a blade with 14 teeth per inch (the coarser the teeth the better the cut). Scribe a line on the slate, whether it be a circle or straight, and cut through vertically.
A saw is used to cut materials. Different saws for diverse materials and shapes of cut.
A crosscut saw.
To use a tendon saw first grip the saw handle with your hand and align the blade with the cut line. Score the wood by making a single cut and use that to continue cutting forward.