IKMC 2027 - Grades 3-4 - Self-study SET 2 - Thematic Batch 3 Question 20

A ribbon has equally spaced holes, 2 cm apart, as shown. Its ends are joined to form a circle. How many centimetres greater is the circumference when the ends overlap at one hole than when they overlap at five holes?
Diagram labels: “Dải băng” means ribbon. The circular diagram shows the ribbon joined with one pair of holes overlapping.