(i)Circles touching externally
![](https://ai-shiksha.com/wp-content/uploads/2024/02/maharashtra-board-sol-class-10-maths-p2-chapter-3-5.png)
If the circles touch each other externally, distance between their centres is equal to the sum of their radii.
Distance between the centres = 4+2.8 = 6.8cm
(ii)Circles touching internally
![](https://ai-shiksha.com/wp-content/uploads/2024/02/maharashtra-board-sol-class-10-maths-p2-chapter-3-6.png)
The distance between the centres of the circles touching internally is equal to the difference of their radii.
Distance between the centres = 4-2.8 = 1.2cm