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- Edges (en)
- Bermuda-rigged Yawl with triangular jib and main and mizzen sails with cross-cut construction—parallel panels, sewn together. (en)
- Corners (en)
- Dhow with triangular lateen sail. (en)
- Quadrilateral lug-rigged vessel. (en)
- The Russian sail training ship Kruzenshtern has triangular jibs at the bow, square sails on three masts, and a quadrilateral gaff-rigged sail at the stern. (en)
- Yacht flying a triangular, symmetric spinnaker with tri-radial construction—panels radiating from all three corners. (en)
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