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Question

The circle x2+y2=c2 contains the ellipse x2a2+y2b2=1 if

A
c<a
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B
c<b
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C
c>max(a,b)
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D
c>min(a,b)
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Solution

The correct option is D c>max(a,b)
Given, Circle equation as , x2+y2=c2 and
Ellipse equation as ,x2a2+y2b2=1
Both equation has center as (0,0)
Vertices of circle equation are (c,0),(c,0),(0,c),(0,c)
Vertices of ellipse equation are (a,0),(a,0),(0,b),(0,b)
for ellipse to contain within circle, c>a,c>b
C should be greater than max(a,b).

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