“Pappus' theorem”的概念、定义、翻译、参考文献-科学参考

单词	Pappus' theorem
释义	Pappus' theorem [`pap·ǝs ´thir·ǝm] ^MATHEMATICS 1. The proposition that the area of a surface of revolution generated by rotating a plane curve about an axis in its own plane which does not intersect it is equal to the length of the curve multiplied by the length of the path of its centroid. 2. The proposition that the volume of a solid of revolution generated by rotating a plane area about an axis in its own plane which does not intersect it is equal to the area multiplied by the length of the path of its centroid. 3. A theorem of projective geometry which states that if A, B, and C are collinear points and A', B' and C' are also collinear points, then the intersection of AB' with A'B, the intersection of AC' with A'C, and the intersection of BC' with B'C are collinear. 4. A theorem of projective geometry which states that if A, B, C, and D are fixed points on a conic and P is a variable point on the same conic, then the product of the perpendiculars from P to AB and CD divided by the product of the perpendiculars from P to AD and BC is constant.
随便看	equivalent binary digits equivalent blackbody temperature equivalent circuit equivalent conductance equivalent continued fractions equivalent diameter equivalent electrons equivalent elements equivalent equations equivalent evaporation equivalent focal length equivalent footcandle equivalent four-wire system equivalent head wind equivalent height equivalent magnetic length equivalent map projection equivalent nitrogen pressure equivalent noise conductance equivalent noise pressure equivalent noise resistance equivalent noise temperature equivalent nuclei equivalent orifice equivalent periodic line

科学参考收录了103327条科技类词条，基本涵盖了常见科技类参考文献及英语词汇的翻译，是科学学习和研究的有利工具。