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Quandaries & Queries
Q & Q
 Topic: spherical geometry
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6 items are filed under this topic.

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 Great circle course 2012-01-25 From Hervé:On the earth, the mathematical formula giving the distance between two points, and the initial course for a boat on the great circle is well known. I need to find the inverse formula, ie knowing an initial position on earth, and the initial course of the boat, and the distance to run on the great circle, the formula gives the final position (longitude and latitude).Answered by Robert Dawson. A triangle on a sphere 2009-09-07 From Rohit:How do I find the angles of a triangle drawn on a sphere (spherical triangle)?Answered by Chris Fisher. A convex quadrilateral in spherical geometry 2008-07-09 From Joan:What is the min and max number of obtuse angles possible ia a convex quadrilateral in Spherical Geometry? I know that the Saccheri has 2 obtuse angles and the Lambert has one, but are there other possibilities? Thanks for your help.Answered by Chris Fisher. Non-euclidean geometry 2003-12-08 From Geoffrey:How can you use non-euclidean geometry to navigate on a sphere? What geometers did work in this area?Answered by Chris Fisher. Non-Euclidean geometry 2003-12-03 From Geoffrey:What are the applications of Non-Euclidean geometry (especially hyperbolic and spherical)?Answered by Walter Whiteley. Surface area of a contact lens 2000-06-06 From Evie Contreras:I would like to know how to calculate the surface area of a contact lens with a radius of 7mm? I know that the area of a circle is pi R squared, but a contact lens has a dome.Answered by Harley Weston.

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