Two circles with radii of 8 cm and 4cm respectively touch each other externally at the point A .PQ is the direct common tangent find the length of tangent

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Answers

2014-05-14T10:29:36+05:30
Length of direct common tangent = (d^2 - (R1 - R2)^2)^1/2
where d = distance between two circle  R1 = radius of first circle  , R2 = radius of second circle 
 length = (12^2 - 4^2)^1/2
           = 8√2 Cm
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