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N=20;
rotate (a = [0, 0, 36]) {
union() {
translate ([1, 0]) {
polygon (points = [[(N - 1)*cos(180/N), -(N - 1)*sin(180/N)],
[(N - 3)*cos(270/N), -(N - 3)*sin(270/N)],
[(N - 1)*cos(270/N), -(N - 1)*sin(270/N)]]);
polygon (points = [[(N - 1)*cos(180/N), -(N - 1)*sin(180/N)],
[(N - 3)*cos(180/N), -(N - 3)*sin(180/N)],
[(N - 3)*cos(270/N), -(N - 3)*sin(270/N)]]);
polygon (points = [[N - 1, 0], [N - 3, 0],
[(N - 3)*cos(180/N), -(N - 3)*sin(180/N)]]);
polygon (points = [[N - 1, 0],
[(N - 3)*cos(180/N), -(N - 3)*sin(180/N)],
[(N - 1)*cos(180/N), -(N - 1)*sin(180/N)]]);
polygon (points = [[N - 1, 0], [N - 3, 0],
[(N - 3)*cos(180/N), (N - 3)*sin(180/N)]]);
polygon (points = [[N - 1, 0],
[(N - 3)*cos(180/N), (N - 3)*sin(180/N)],
[(N - 1)*cos(180/N), (N - 1)*sin(180/N)]]);
polygon (points = [[(N - 1)*cos(180/N), (N - 1)*sin(180/N)],
[(N - 3)*cos(180/N), (N - 3)*sin(180/N)],
[(N - 3)*cos(270/N), (N - 3)*sin(270/N)]]);
polygon (points = [[(N - 1)*cos(180/N), (N - 1)*sin(180/N)],
[(N - 3)*cos(270/N), (N - 3)*sin(270/N)],
[(N - 1)*cos(270/N), (N - 1)*sin(270/N)]]);
}
circle (r = 20);
}
}
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