doubly ruled surface इन हिंदी

doubly: भली भाँति दुगना

ruled surface: रेखज पृष्ठ रेखज

surface: बाह्य परत तल धरातल

	1.	These are doubly ruled surfaces of negative Gaussian curvature.
	2.	The hyperbolic paraboloid and the hyperboloid of one sheet are doubly ruled surfaces.
	3.	The hyperbolic paraboloid is a doubly ruled surface : it contains two families of mutually skew lines.

अंग्रेज़ी→नहीं। नहीं।→अंग्रेज़ी