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usage message fixes and doc tweaks
remove triangle area, optimize polygon_area for triangles
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@@ -768,9 +768,9 @@ module test_polygon_area() {
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assert(approx(polygon_area(rot([13,27,75],
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p=path3d(circle(r=50,$fn=1000),fill=23)),
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signed=true), PI*50*50, eps=0.1));
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assert(abs(triangle_area([0,0], [0,10], [10,0]) + 50) < EPSILON);
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assert(abs(triangle_area([0,0], [0,10], [0,15])) < EPSILON);
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assert(abs(triangle_area([0,0], [10,0], [0,10]) - 50) < EPSILON);
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assert(abs(polygon_area([[0,0], [0,10], [10,0]],signed=true) + 50) < EPSILON);
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assert(abs(polygon_area([[0,0], [0,10], [0,15]],signed=true)) < EPSILON);
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assert(abs(polygon_area([[0,0], [10,0], [0,10]],signed=true) - 50) < EPSILON);
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}
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*test_polygon_area();
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