http://demonstrations.wolfram.com/TrianglesInTheCoordinatePlane/
The Wolfram Demonstrations Project contains thousands of free interactive visualizations, with new entries added daily.
This Demonstration allows you to manipulate the endpoints of a triangle in a Cartesian coordinate system and finds the perimeter and area of the triangle. The perimeter is found by summing the distances between the endpoints of successive sides and the ...
Contributed by: Ed Zaborowski and Kris Climer
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