Q.

An ellipse is drawn by taking a diameter of the circle (x  1)2 + y2 = 1 as its semi minor axis and a diameter of the circle x2 + (y  2)2 = 4 as its semi-major axis. If the centre of the ellipse is at the origin and its axes are the coordinate axes, then the equation of the ellipse is

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a

x2+4y2=16

b

4x2+y2=4

c

x2+y2=8

d

4x2+y2=8

answer is D.

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Detailed Solution

Given circles are

(x-1)2+y2=1 length of semi minor axis =diameter of circle =2r=2 i.e b=2 and x2+(y-2)2=4  length of major axis =length of diameter=2r=4 i.e a=4

equation  of ellipse is  x2a2+y2b2=1 x216+y24=1

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