9mm
If the radius of a circle is 18mm, its diameter is: 36mm
The answer is 9
9mm
9 mm
Diameter = 2 x radius = 18 mm .
254.47 square mm
18mm or 1.8 cm
The radius of any circle is its diameter divided in half. So: 18mm/2 = a radius of 9mm
18mm is 0.70866 inches.
18mm is 1.8cm
18mm = 0.018m
7cm is much more than 18mm. Through conversions, 7cm is the same as 70mm, and 18mm is 1.8cm.