§4.6, p. 63 — the cotangent weights are intrinsic: (cot ∠uqv + cot ∠upv)/2 = Σ (−ℓ²_uv + ℓ²_vq + ℓ²_uq)/(8 a_uvq), Heron areas

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§4.6, p. 63 — the cotangent weights are intrinsic: (cot ∠uqv + cot ∠upv)/2 = Σ (−ℓ²_uv + ℓ²_vq + ℓ²_uq)/(8 a_uvq), Heron areas · Prove2Me