Measure the inner diameter of one o

Measure the inner diameter of one of your rings with a ruler, note the size.
Multiply the result by 3.14 to get the circumference in millimeters.

ผลลัพธ์ (อังกฤษ) 2:

The measure of one of your Inner Diameter Rings with a Ruler, note the Size.
Multiply by 03/14 to the Result Get the circumference in millimeters.