We know that the circumference of a circle is 28.26 cm. What is its radius and diameter

From C = 2 * pi * r, d = 2R, it is obtained that:
R = C / 2 pi
=28.26/(2*3.14)
=28.26/6.28
=4.5 (CM)
d=2r
=2*4.5
=9 (CM)
A: its radius is 4.5cm and its diameter is 9cm