Which expression is a way to represent the ratio of a to b?
a. b : a
b. b to a
c. a/b
d. b/a

Find the radius of a circle that has a circumference of 16. the formula for the circumference of a circle is c = 2tr, where r is the radius and c is the circumference. the equation solved for r is r = c over 2π. r=4 r= 8 r=12 r= 16