Use 3.14 for n.
Which of the following correctly relates the measures of the diameter (d) and radius (r) of a circle?
The correct relationship between the diameter (d) and radius (r) of a circle is:
d = 2r
This is because the diameter is the distance across the circle passing through the center, which is twice the length of the radius (the distance from the center to any point on the circle).
For example, if the radius of a circle is 5 cm, then the diameter would be:
d = 2r = 2(5) = 10 cm