Posted by **Knights** on Thursday, March 21, 2013 at 5:07pm.

Two circles of radius 1 are externally tangent at Q . Let PQ and QR be diameters of the two circles. From P a tangent is drawn to the circle with diameter QR , and from R a parallel tangent is drawn to the circle with diameter PQ . Find the distance between these two tangent lines.

Could someone help me please, I tried drawing right triangles but they didn't seem to work....Thanks

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