The radii of the two circles are 6 cm & 8 cm respectively. The distance between the center of the two circles is 15 cm, then find the ratio of the length of the direct common tangent to the length of the transverse common tangent.
1. √321 ∶ √29
2. √221 ∶ √19
3. √221 ∶ √29
4. √121 ∶ √29

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