how to calculate circumference when given the diameter : I have to write a code that will give me the circumference when I am given the diameter of 2 meters

My code is written like this:

Sub WorksheetFunctionDemo3()

Debug.Print WorksheetFunction. Pi(2)

End sub

but it is coming up with an error. I know without the (2) it'll give me the value of pi, but i can't figure out how to multiply it by 2