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$\begingroup$ when I tried pts = {{5, 2}, {4, 1}, {1, 3}}; GraphicsMeshMeshInit[]; PolygonArea[pts] I got -2.5. I don't understand. $\endgroup$

minthao_2011
– minthao_2011

2014-06-24 15:49:33 +00:00
Commented Jun 24, 2014 at 15:49
$\begingroup$ @minthao_2011 the order does matter. Try PolygonArea[Reverse@pts]. If it is only a matter of clockwise or anticlockwise order you can use Abs. $\endgroup$

Kuba
– Kuba

2014-06-24 16:02:50 +00:00
Commented Jun 24, 2014 at 16:02

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