Q: If the radius is 3.9 what is the diameter?

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Radius = Diameter/2 Diameter = 2* Radius

to get the diameter from the radius you simply multiply the radius by 2 since the radius is half the diameter. d=2r where d = diameter and r = radius

A radius is one half of a diameter so divide by two to get from a diameter to a radius. Or you can multiply the radius by 2 to get to the diameter.

The length of a radius is not the length of a diameter. The diameter is two times the length of the radius.

The diameter of a circle is twice its radius.

The radius is half the diameter. So, if the diameter is 8, then the radius is 4.

A radius is half of a diameter. Example Diameter:4 Radius:2

radius = diameter/2

When you have the radius of a circle and you are trying to find the diameter, multiply the radius by two; the answer is the diameter. If you have the diameter and want to find the radius, divide the diameter by two; the answer will be the radius. The diameter is 54 centimeters.

The relationship between the radius and the diameter of a circle is that: radius = diameter /2

the radius is one-half the diameter radius = diameter/2 diameter = 2 x radius

The radius of a circle is equal to half of it's diameter. To convert the diameter into the radius, simply divide it by two.For example: if the diameter is 10, then the radius would be 5