Question

Two circles, each of radius 4
cm, touch externally. Each of
these two circles is touched
externally by a third circle. If
these three circles have a
common tangent, then the
radius of the third circle, in
cm, is​

Answer 1

Answer:

r = 1 cm

Step-by-step explanation:

Answer 2

Answer: 1

Step-by-step explanation:
Consider a diagram having 2 circles with radius 4cm and the smaller one between them having radius x,
(4+x)^2 = 4^2 + (4-x)^2
On solving, you will get x as 1cm