Question

4.9 are radii of two circles touching each other and 'r is a radius of smallest circle touching two
circles and direct common tangent of both circles, then 125r =
​

Answer 1

Answer:

r=36/25

125r=108

Step-by-step explanation:

radius of the circle touching two circles and their direct common tangent is given by the formula

1/√r +1/√r'= 1/√r''

here's the derivation