Your coworker asked you to harvest recombinant insect cells that will mature while he is out of town at a conference. He wrote up a protocol for making a frozen stock of the cells that requires you to pellet the cells, resuspend them in freezing medium, then store them in liquid nitrogen until his return. But he didn't tell you which of the 8 rotors in his lab to use. His protocol says to centrifuge the cells at 3640 rpm for 12 min. and you remember reading that recombinant insect cells were normally centrifuged at 625 X g. What is the radius of the rotor you would use (in cm)? Answer to one decimal place.