Hi,

Consider following code:

vardef polygon_with_side(expr n, s) =
save a, b, r; numeric a, b, r;
a * n = 360; a + 2b = 180; r = s * sind(b) / sind(a);
for i = 0 upto n-1: (0, r) rotated (a * i) -- endfor cycle
enddef;

beginfig(1);
path p; p = polygon_with_side(21, 20);
draw p;
endfig;
bye;

It draws a polygon with 21 sides with radius 20. I understand all of
it except the for loop.

What is (0, r) rotated (a *i) doing?

-- 
Respect,
Shiv Shankar Dayal
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