Question 748181
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Write an equation of an ellipse with the given characteristics. 
Center (0,0), vertical major axis of length 12, minor axis of length 4
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The major semi-axis is vertical   of the length  of  12/2 = 6.

The minor semi-axis is horizontal of the length  of  4/2 = 2.


The standard equation of the ellipse is


    {{{x^2/2^2}}} + {{{y^2/6^2}}} = 1.
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Solved.