The complex formula log z defines a polar grid. The real part is (xx+yy)^.5 and the imaginary part is atany/x. Plotting this will give you concentric circles and lines radiating from (0,0) at right angles to the circles.
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Snap helps to connect lines to endpoints of other lines. Grid can be used for even spacings, measuring, but polar that can keep your lines perfectly horizontal or vertical
a coordinate grid is a grid that has coranades on it (ex.(4,7))
4 squares in a 2 by 2 grid 9 squares in a 3 by 3 grid 16 squares in a 4 by 4 grid 25 squares in a 5 by 5 grid 36 squares in a 6 by 6 grid 49 squares in a 7by 7 grid 64 squares in a 8 by 8 grid 81 squares in a 9 by 9 grid 100 squares in a 10 by 10 grid
grid lines are like calligraphy
you just count the grid