A graph shows the relationship between the diameter and the circumference of a circle with the point (1, 3.14) shown.

Question

Find three more points that are on the line.

Answer 1

(2, 6.28), (3,9.42), (4,12.57) etc.,  were each y value is rounded to two decimal places.  

In general, the points on the line are (d, pi*d)