1.

Two circles with radii r_(1) and r_(2), r_(1)gtr_(2)ge2 touch others externelly. If alpha is the angle between direct common tangents then "sin"(alpha)/2=(r_(1)-r_(2))/(r_(1)+r_(2))

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Answer :`"SIN"(alpha)/2=(r_(1)-r_(2))/(r_(1)+r_(2))`


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