If by an 8 inch circle, you mean that the circumference is 8 inches, then
the radius would be found using:
C =pi x diameter
8 =3.14 x diameter
8/3.14= diameter
and since diameter = 2 x radius
2.55 = 2 x radius
2.55/2 = radius
therefore, the radius is approximately 1.27 inches
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The diameter is the radius squared, so the diameter is 16. 16 radius is 1/2 across and diameter is across. Acording to its roots dia means across and meter means measure.