What is the radii argument for rectangles?

rect(0, 0, s*xscale, s*yscale, 7); 
/// 0: x-coordinate, 0: y-coordinate, s*xscale: width, s*yscale: height, 7: the radii for all four corner

How to understand that 7 is the radii for all four corners of the rectangle? Any comments are greatly appreciated.

pls first look up a command
like in this online reference

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The corners are round (optional)

The degree of the roundness is 7

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