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The equation โ[(x-2)2+(y-1)2]ย + โ[(x+2)2+(y-4)2]=5 represents circle/ ellipse/ line segment??? Elaborate how.
The given eqn is the eqn of an ellipse.If you note carefully you will find that the eqn represents the sum of the distances of a point (x,y) from (2,1) & (-2,4) resp. which is constant & equal to 5. This basically is the definition of an ellipse. Ellipse is defined as a curve in which the sum of the distances of any point on it from the focii is constant.Here the focii of the ellipse are (2,1) & (-2,4).
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