1.

r_1, r_2are the radii of two non intersecting circles having A , B as centres. If 'P' is the mid- point of AB ,then the perpendicular distance of P from their radical axis is

Answer»

` |( r_1^(2) -r_2^(2))/( 2AB) | `
` |(r_1^(2) + r_2^(2))/( 2AB) | `
` |( 2AB) /( r_1^(2) +r_2^(2))| `
` |( 2AB) /( r_1^(2) -r_2^(2))| `

ANSWER :A


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