**Online calculator: Polygon area - PLANETCALC**
https://planetcalc.com/1466/

Jun 06, 2011 · This online calculator calculates the area of a polygon given lengths of polygon sides and diagonals, which split the polygon into non-overlapping triangles. As shown in the picture, you can sum areas of triangles ABD, BCD, and ADE to calculate the polygon ABCDE area. To do this, you need lengths of diagonals: BD and AD, but this is all you need. The thing is that you can calculate the area …

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