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Question

Let the latus ractum of the parabola y2=4x be the common chord to the circles C1 and C2 each of them having radius 25. Then, the distance between the centres of the circles C1 and C2 is:

A
8
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B
85
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C
45
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D
12
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Solution

The correct option is A 8

Length of latus rectum =4
AB=2

Given, C1B=C2B=25
Now, (C1A)2+4=(25)2
C1A=4
C1C2=2C1A=8

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