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The two circles x^2+""y^2=""a x and x^2+...

The two circles `x^2+""y^2=""a x` and `x^2+""y^2=""c^2(c"">""0)` touch each other if :
(1) `2|a|""=""c` `" "` (2) `|a|""=""c` `" "` (3) `a""=""2c` `" "` (4) `|a|""=""2c`

A

2 |a|=c

B

|a| =c

C

a=2c

D

|a| =2c .

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MODERN PUBLICATION-CONIC SECTIONS-EXERCISE
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