radius is 9mm, since it is 2 times less than diameter... circumference is diameter*pi so 18*pi mm. approx. 56,52 mm , but if you need exact answer leave the one with pi
The diameter is double the radius so the radius is 9. To figure out the circumefrence you multiply the diameter by pi so you should get 56.548. Your welcome
radius is 9mm, since it is 2 times less than diameter... circumference is diameter*pi so 18*pi mm. approx. 56,52 mm , but if you need exact answer leave the one with pi
