/usr/lib/realtimebattle/Arenas/Triangle.arena is in realtimebattle-common 1.0.8-14.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
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boundary -1.0 -1.0 1.0 0.73205
closed_polygon 0.7 0.7 0.06 3 -1.0 0.73205 0.0 -1.0 1.0 0.73205
exclusion_point -1.0 -1.0
exclusion_point 1.0 -1.0
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