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![[Post New]](/templates/default/images/icon_minipost_new.gif) 24 Aug 2008 16:07:36 IST
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An elipse has OB as semi minor axis.F,G are foci.Angle FBG=90.Find ecentricity of ellipse?
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draw d fig u'll get angle BFO=angle BGO=45 deg
thus FBO too becomes n isoceles ryt angled triangle
thus
FO=BO
ae=b
squaring
(ae)^2=a^2(1-e^2)
2e^2=1
e=1/rt2
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