Most rounded cuts in pavers are done whenever you include fancy fans and curves in the pattern of your design.  With straight patterns, particularly running herringbone, you'll have to cut the openings near the edges of the project so as to match the pavers within the particular measurements, but those are straight cuts.

If you need to know how to cut concrete pavers, this guide is for you.

You’ll want to space the border evenly, so spread a row or two the width of the sidewalk, and center such that you have an even amount of paver on either border.  That tells you how much to cut the border pavers with straight cuts, if your surface runs in a straight line and is a consistent width.

In that scenario, you’ll do most of your masonry cutting near or at the border. Take a complete brick and line it up with the edge of the previous brick in the same direction. Use it as a straightedge on the paver you laid, and utilize a masonry pencil to draw a direct line on the brick where you want the boundary of the surface. 

Then, cut on the paver on this line. If you’re a professional contractor or have several projects to do over the coming years, consider list of professional masonry table saws, which starts with the most budget conscious and increases in capability, features and benefits for your convenience.

After completing your masonry cut, place the cut paver at the end of the previous paver and you're done with that course. Repeat as required to complete the design pattern.

IF you are developing a curved part of your paver project, you'll have to find a soft, flexible strip of wood helpful as an exterior form that marks the boundary.

Starting with the base of the curve, bend the strip out of wood based on how much curve you need where you'd like it to begin and where you'd like it to end. Then use the pencil to mark out a line on each one of the affected brick that will need to be cut with curved line. 

Take each paver and make the cuts, replacing them when completed. Again, if you have several projects, of many curved lines to make, a cut-off saw can make quick work of masonry cutting many curves in a row.

Check out this Husqvarna K770.
Don’t forget safety goggles to defend your eyes, of course. An appropriate dust mask should also be worn. Diamond blades cut through paving stone like a sharp knife through warm butter, but also will produce particulates from which you’ll want to protect your eyes and lungs.