The circles having radii r1 and r2 inter...

The circles having radii r_1 and r_2 intersect orthogonally. Length of their common chord is

`(2r_1r_2)/sqrt(r_1^2+r_2^(2))`

`sqrt(r_1^2+r_2^(2))/(2r_1r_2)`

`(r_1r_2)/sqrt(r_1^2+r_2^(2))`

`sqrt(r_1^2+r_2^(2))/(r_1r_2)`

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