The radius of two circles is 3 cm and 4 cm. The distance between the centres of the circles is 10 cm. What is the ratio of the length of direct common tangent to the length of the transverse common tangent ?
Show answer & explanation
Correct answer: B
Explanation
The correct answer is option 2 ie √33 : √17.
Direct common tangent = 
Transverse common tangent = 
DCT/TCT = 
= 
= √91/√51
= √33/√17