The name of half a diameter is a radius.
6 in.
d = 2r
Divide the perimiter, or circumference, by pi (3.1415), which is the diamter, then divide that by 2 to get the radius
What measure does the 15 cm relate to. Radius, Diamter, of Circumference.
diamter=2xradius, so if you have the diameter, divide by 2 and you have the radius. r=d/2
The radius is 1/2 the diameter. So, since the diameter is 8 the radius of the circle would be 4.
Circumfrence=Pi x Diamter=Pi x 2Radius
Radius = Diameter/2 so if diameter = 20 Radius = 20/2 = 10
The question does not make sense on several levels.Raduis and diamter are not real words.If they are meant to be radius and diameter, then a radius of 6 is inconsistent with a diameter of 11 for any regular shape.If the shape is not regular, then a lot more information is required.
you cant: pi is the same for any circle - 3.1415... the diamter or the radius has to be given diameter divided by two equals the radius the radius times two equals the diameter
a CD is 120mm (4.7 inches) in diameter and 60mm radius, the hole is 15mm diamter (0.6 inches).