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0=0 Insert new rubber band
T Erase rubber band
Col Change rubber band color
A Calculate area

Drag vertices and edges.
Drag all mesh touching thumbtacks.

Zoom mesh with 'pinch zoom'.

Square or isometric mesh.

Calculate area contained inside the rubber band (only in square mesh).
Pick's Theorem:
A = I + B/2 -1

A = Area
I = Inner dots.
B = Border dots.

Convex, concave polygons, positive or negative areas

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