For graph, pls refer to: http://www.flickr.com/photos/24634737@N04/40767655...
Besides, general formula for eccentricity (e),
r = L/[1 + (e)(cos(rθ))]
so
r = (-2)/[2+cos(θ)]
r = (-1)/[1+(1/2)(cos(θ))]
e = 1/2
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For graph, pls refer to: http://www.flickr.com/photos/24634737@N04/40767655...
Besides, general formula for eccentricity (e),
r = L/[1 + (e)(cos(rθ))]
so
r = (-2)/[2+cos(θ)]
r = (-1)/[1+(1/2)(cos(θ))]
e = 1/2