Circle o has a circumference of 42 pi

What is the length of the radius, r?

a. √21 cm
b. √42 cm
c. 21 cm
d. 42 cm


PLEASE HURRY!! I HAVE LIMITED TIME!! :)

Circle o has a circumference of 42 pi What is the length of the radius r a 21 cm b 42 cm c 21 cm d 42 cm PLEASE HURRY I HAVE LIMITED TIME class=