Question

What is the independent variable? diameter circumference

Answer 1

The circumference is the independent variable, because the diameter depends on the circumference. Hope this helped.

Answer 2

it depends on which way you write the equation
\[\pi=\frac{ C }{ 2R }\]
\[C=2\pi R\]
R is the independent variable.
\[R=\frac{ C }{ 2\pi }\]
C is the independent variable.