Varshika drew \(6\) circles with different sizes. Draw a graph for the relationship between the diameter and circumference of each circle as shown in the table and use it to find the circumference of a circle when its diameter is \(6 \ cm\).
| Diameter (\(x \ cm\)) | \(1\) | \(2\) | \(3\) | \(4\) | \(5\) |
| Circumference (\(y \ cm\)) | \(3.1\) | \(6.2\) | \(9.3\) | \(12.4\) | \(15.5\) |
Ans:
This is a type of .
Proportionality constant .
Circumference of a circle when its diameter is \(6 \ cm=\) .