Two circles with radii a and b touch eac...

Two circles with radii a and b touch each other externally such that `theta` is the angle between the direct common tangents `(agtbge2)` , then

`theta=sin^(-1)((r_1+r_2)/(r_1-r_2))`

`theta=2sin^(-1)((r_1-r_2)/(r_1+r_2))`

`theta=2cos^-1((2sqrt(r_1r_2))/(r_1+r_2)`

none of these

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