SOLUTION: what is the radius of a circle with a diameter of 8 inches

Here is a circle



Here is its radius, which is half way across the circle:



Here is its diameter, which is all the way across the circle:



So you can see that the radius is one-half of the diameter.
So if the diameter is 8 inches, the radius must be one-half of
8 inches, or 4 inches.

Easy, wasn't it?

Edwin