Working out diameter and radius from circumference. How.

Answer:
d = 28 cm
r = 14 cm
Step-by-step explanation:
Circumference = Pi × Diameter
( Divide both sides by Pi )
Circumference ÷ Pi = Diameter
28 ÷ π = Diameter
Diameter = 28
Radius = Half the diameter
28 ÷ 2 = 14