basic shapes - arc not available?

Along with rectangles and ellipses, arcs are a very common basic
shape. The Win32 API, Xlib, PostScript etc all allow you to easily
draw arcs.

If the SVG file is machine-generated then the arc can be approximated
using bezier curves.

But if you are hand-coding an SVG file then unless you are a math
whiz, it is nearly impossible to figure out what bezier curve 
coordinates to use to approximate the arc.

Since arcs are so common, it ought to made available as one of the 
basic shapes.

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