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Parallel and perpendicular lines on a plane

This online calculator checks lines' slopes to see if they are parallel or perpendicular

Parallel and Perpendicular LinesCreative Commons Attribution/Share-Alike License 3.0 (Unported)

Polygon area

Online calculator which calculates area of a polygon given lengths of polygon sides and diagonals which split polygon to nonoverlapping triangles

Polygon areaCreative Commons Attribution/Share-Alike License 3.0 (Unported)
Sides and diagonals
Import data.
"One of the following characters is used to separate data fields: tab, semicolon (;) or comma(,)" 
Add Import data. Clear table
0.12345678901234567890

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