The image contains a geometric arrangement of circles forming a triangular shape. The problem appears to focus on calculating a certain length related to the setup of the circles. Based on the image, it seems the task involves determining the length of a side or perimeter related to the triangular arrangement of circles. The diameter of each circle is given as 20 cm.

Problem breakdown:

1. The circles are arranged in a triangular configuration.
2. The diameter of each circle is 20 cm, which means the radius of each circle is 10 cm.
3. The task might be to calculate the height or the side length of the equilateral triangle that fits this arrangement.

To proceed, could you confirm whether you are asking for the side length of the triangle or another specific measurement (e.g., height)? Let me know if you'd like me to continue based on this assumption or provide further clarifications.

If you'd like, I can proceed with calculating the side length of the triangle enclosing these circles.