324mm
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7cm is much more than 18mm. Through conversions, 7cm is the same as 70mm, and 18mm is 1.8cm.
The answer depends on what the "36 inch" measures: inside circumference, radius, diameter?
That's in the right order.
Measure the inside diameter and multiply it by 3.14159 (pi)
The area of a circle is the amount of space inside the circle. The circumference of a circle is the distance around the outside of the circle. (So no, they are not the same thing.)