Calculate area of an enclosed irregular shape

From: PG <paulgent@xxxxxxxxx>
Date: Mon, 23 Jan 2012 14:11:03 -0800 (PST)

Hi,

I have a series of approx. 40 points (x,y) that make up an irregular
shape.

Is there a simple library / function that I can call that will
calculate the enclosed area of this shape?

TIA.

PG
.

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