Google Maps API v2 had great methods for lines and polygons to calculate length and area.
v3 is lacking these methods (maybe just for now?).
What other options do I have for calculating line length and polygon area?
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Daft Logic just updated to v3
But for both line and area using v3 Google Maps API here:
Here is an Android app with many different measure features (area, distance, and angles measurements on Google Maps with different units): Planimeter - GPS area measure