| 单词 | primitive circle |
| 释义 | > as lemmasprimitive circle primitive circle n. Mathematics and Geology †(a) the meridian from which longitude is reckoned (obsolete); (b) a circle in which a sphere intersects the plane on to which its surface is to be projected (cf. primitive plane n.). 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 1690 W. Leybourn Cursus mathematicus f. 668v The Meridian passing through L is the Primitive Circle. 1701 S. Heynes Treat. Trigonom. 104 Note that the Pole of an Oblique Circle is in that Diameter of the primitive Circle, which passes through the Center of the projected Oblique Circle. 1895 N. Story-Maskelyne Crystallogr. ii. 25 The plane of projection thus bounded by a great circle of the sphere is represented by the plane of the paper on which the circle is drawn, which latter will be termed the circle of projection or primitive circle. 1951 Proc. Royal Soc. A. 206 243 (caption) The plane of symmetry of the crystal is taken as the primitive circle. < as lemmas |
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