sphere.py $>...$

Radius$=$float$($input$("$Enter the radius: $"))$

Diameter $=2*$ Radius

Circumference $=2**3\mathrm{.}14**$ Radius

SurfaceArea $=4**3\mathrm{.}14**$ Radius $****2$

Volume $=\frac{4}{3}**3\mathrm{.}14**$ Radius $****3$

print$("$Diameter: $",$ Diameter$)$

print$("$circumference:$",$ circumference$)$

print$("$Surface Area: $",$ SurfaceArea$)$

print$("$Volume: $",$ volume$)$

Why is this code not displaying $6\mathrm{.}0$ with an input of $3?$