Hello :).

How can I calculate the polygon center point using its vertexes?

Thanks

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- Jul 21st 2006, 02:47 AMratPolygon Center Point
Hello :).

How can I calculate the polygon center point using its vertexes?

Thanks - Jul 21st 2006, 02:48 AMQuickQuote:

Originally Posted by**rat**

- Jul 21st 2006, 02:55 AMrat
No, they also can be irregular...

- Jul 21st 2006, 03:57 AMCaptainBlackQuote:

Originally Posted by**rat**

interested in?

Centre of mass of unit weights at the vertices.

Centre or mass of rods of unit mass per unit length making

up the sides of the polygon.

Centre of mass of a lamellar of unit mass per unit area in

the form of the polygon.

Or some other centre? - Jul 23rd 2006, 01:20 PMRebesques
Since the polygon may be irregular, rat must mean the center of mass, when every vertex point $\displaystyle \vec r_1,\ldots,\vec r_n$(plural: vertices ;)) has nonzero mass $\displaystyle m_1,\ldots,m_n.$ Then the center of mass lies at the tip of the vector

$\displaystyle \vec r=\frac{m_1\vec r_1+\dots+m_n\vec r_n}{m_1+\ldots+m_n}$.

Hope this is ok.