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[" Two circles with radii "a" and "b" touch each other externally "],[" such that "theta" is the angle between the direct common tan- "],[" gents "(a>b>=2)," then "],[" a."theta=2cos^(-1)((a-b)/(a+b))],[" b."theta=2tan^(-1)((a+b)/(a-b))],[" c."quad theta=2sin^(-1)((a+b)/(a-b))],[" d."theta=2sin^(-1)((a-b)/(a+b))]

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