双曲幾何における極三角形 [in Japanese] Hyperbolic polar triangles [in Japanese]
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The polar triangle for a hyperbolic triangle is constructed, and a sort of duality between them just like one in the case of the spherical geometry is found. Also, it is found that some formulas which are foundamental in the hyperbolic trigonometry correspond one another in the duality.
- Reports of Kyushu School of Engineering,Kinki University
Reports of Kyushu School of Engineering,Kinki University (28), 89-97, 2000