Answer:
1cm
Step-by-step explanation:
Kindly refer to the attached image for clarity
Given data
Let the big circle have a radius R= 3.5cm
and the small circle have a radius r= 2.5cm
From the image, we can see that the distance between the two centers is the difference of the radii
Distance= R-r
Distance= 3.5-2.5= 1cm
Hence the distance is 1cm
