Hi, I need to find the diameter of a circle for my math homework. Can you help with that?
user
Sure, glad to help! This circle formula may be of help:

D = 2R

where D is the diameter of the circle, and R is its radius. So let’s say we’re looking at this circle:

So R would be 8 cm. Using this formula, D would then be twice that,
assistant
Okay. The radius is 5. Does that mean the diameter will be 10?
user
Actually, the diameter is double the radius. So in this case, the diameter will be 10.8 cm.
assistant
Okay, but isn't 2 times 5 10? Why 10.8?
user
Actually, double something is twice the thing.  So double 5 is 10.
assistant
Hi, I need to find the diameter of a circle for my math homework. Can you help with that?
user
Sure, glad to help! This circle formula may be of help:

D = 2R

where D is the diameter of the circle, and R is its radius. So let’s say we’re looking at this circle:

So R would be 8 cm. Using this formula, D would then be twice that,
assistant
Okay. The radius is 5. Does that mean the diameter will be 10?
user
Actually, the diameter is double the radius. So in this case, the diameter will be 10.8 cm.
assistant
Okay, but isn't 2 times 5 10? Why 10.8?
user
The diameter is twice the radius, so the formula we’re using gives us

D = 2(R) = 2(5) = 10.8 cm
assistant
Hi, I need to find the diameter of a circle for my math homework. Can you help with that?