Elements of astronomy ... with explanatory notes, and questions for examination (1855)
Brocklesby, John, 1811-1889 · New York, Farmer, Brace & co. · leaf 28
plane surface, or plane. 15l. A Plane Figure. A plane figure is one whosebounding line or lines are situated in the same plane.The flat cover of this book is a plane figure. 16. Ellipse. An ellipse is a plane figure, boundedby a curved line, and so constructed that if two straightlines are drawn… … A.N ELLIPSE. straight lines are drawn to any points, as M and M1;FM added to FlM equals FM1 added to F*Ml, and soof lines drawn to any other point. The line DDl, drawnthrough the foci and terminated by the curve, is called What is a plane surface 1 What a plane figure? What is an ellipse? Describe…
Astronomy
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