| 单词 | point-circle |
| 释义 | > as lemmaspoint-circle point-circle n. Mathematics a mathematical point regarded as an infinitesimally small circle, or as a degenerate form of a circle. ΘΚΠ the world > relative properties > number > geometry > shape or figure > [noun] > two-dimensional > closed curve > circle > other primitive circle1690 right circle1842 point-circle1865 in-circle1883 1865 Proc. Royal Soc. 14 105 The fundamental conic consists of a point-circle. 1951 W. W. Elliott & E. R. C. Miles College Math. (ed. 2) xx. 272 This circle of zero radius is sometimes called a point circle. 1991 Math. Mag. 64 162 Coolidge pointed out this duality between point-circle theorems and ray-cycle theorems. < as lemmas |
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