What form the right and left triangular ligaments?

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The right and left triangular ligaments are peritoneal reflections that come from the coronary ligament. The coronary ligament attaches the liver to the diaphragm, and as it drapes over the liver’s bare area it splits into two layers that reflect onto the diaphragmatic surface at the right and left sides. Those reflected folds form the triangular ligaments, giving the liver its right and left diaphragmatic margins.

So these ligaments are essentially continuations of the coronary ligament, not connections between the gallbladder and liver, extensions of the falciform ligament, or branches of the portal vein.