Asymptote: CSE5
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Mark Angle ( MA )
function MA ( pair A, real t1, real t2, label L, color C)
Marks an angle around point A, starting at angle t1 degrees (0 is the horizontal Ox axis, if the coordinate system would be centered in A), up to angle t2, with label L ("$\frac{\pi}{3}$" for example is a good value for this parameter), and color C (options are: g (gray), lb (light blue)).