Last Updated
：2025/12/07
ideal triangle
（ plural ）
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In hyperbolic geometry, a triangle whose vertices are all ideal; i.e. points at infinity, rather than real.
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ideal triangle
In the Poincaré disk model, an ideal triangle has all three vertices on the boundary at infinity.
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In the Poincaré disk model, an ideal triangle has all three vertices on the boundary at infinity.
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