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Question

A circle C of unit radius passing through the centers of the circles C1:x2+y2=1 and C2:x2+y2=2x and having center on first quadrant. If R, R1 and R2 are the radical axis of C1 & C2; C & C2; and C & C1 respectively, then which of the following is/are correct?

A
R2:x+3y=1
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B
Radical Center:(12,123)
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C
R,R1 and R2 are concurrent
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D
R2:x3y=1
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Solution

The correct options are
A R2:x+3y=1
B Radical Center:(12,123)
C R,R1 and R2 are concurrent
C1:x2+y2=1Center:(0,0)C2:x2+y22x=0Center:(1,0)Circle passes through two points (0,0) & (1,0)
(xh)2+(yk)2=1
Putting (0,0) & (1,0),
h=12,k=32

Equation of circle is,C:(x12)2+(y32)2=1C:x2+y2x3y=0


The radical axis(R2) is given by
R2:C1C=0
x2+y21(x2+y2x3y)=0
x+3y=1

Similarly, R1:C2C=0
x3y=0
Point of intersection of R1 and R2 is (12,123)

Similarly, R:C1C2=0
x=12

Therefore, R, R1 and R2 are concurrent.

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