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单词 casus
释义 ˈcasus Obs.
[L. cāsus fall, falling.]
Each of the segments of the base of a triangle cut off by a perpendicular falling thereon from the vertex.
1571Digges Pantom. ii. xxiv. P iij b, Diuide both the Casus, that is to say, BD, and DC the distance of eyther Angle from the perpendicular.
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