Parameter	Value	Units		Special Values
Inputs:	r (radius)		meters centimeters millimeters micrometers nanometers inches feet mils yards miles kilometers lightyears angstrom (Å) astronomical unit (AU) fermi (fm) micron (um) nautical mile (nmi) parsec (pc) statute mile (mi) yard (yd) ____________________
Outputs:	A (area)		square meters square centimeters square millimeters square micrometers square nanometers square inches square feet square mils square yards square miles square kilometers square lightyears ____________________
	C (circumference)		meters centimeters millimeters micrometers nanometers inches feet mils yards miles kilometers lightyears angstrom (Å) astronomical unit (AU) fermi (fm) micron (um) nautical mile (nmi) parsec (pc) statute mile (mi) yard (yd) ____________________