Triangle area from three sides. s is semi-perimeter. Works when height is unknown or hard to find.
Land surveying — Irregular plot areas from boundary measurements.
Construction — Triangular roof sections.
Architecture — Triangular window and facade areas.
GPS — Trilateration area calculations.
Fabric cutting — Minimum material for triangular patches.
Sail making — Triangular sail areas.
Truss design — Triangular structural element areas.
Map calculations — Distances known, finding enclosed area.
Forestry — Triangular plot demarcation.
Archaeology — Site boundary calculations.
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