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Question

Show that the length of conjugate axis of a hyperbola is the mean proportional between the length of its transverse axis and the length of its latus rectum.

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Solution

Length of transverse axis is 2a
Length of conjugate axis is 2b
Length of latus rectum is 2a(e21)
mean of length of latus rectum and transverse axis is 2a+2a(e21)2=ae2=e22e21(2ae21)=e22e21(2b)
I.e. Length of conjugate axis of a hyperbola is the mean proportional between the length of transverse axis and the length of its latus rectum

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