It is the equivalent of 1.66 centimeters which is just over 1/2 an inch
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Any number you like. You can have a tiny circle with a tiny diameter or a huge big circle with a big diameter. The diameter is simply the "width" of the circle. It is the length of the line from one side to the other which passes through the centre.
The diameter of a circle is a straight line passing through the center of the circle and connecting two points on the circle. The length of the diameter is equal to twice the length of the radius of the circle. Since there are 2.54 centimeters in an inch, converting the diameter from inches to centimeters would involve multiplying the diameter in inches by 2.54.
Bottle caps are about 2 cm in diameter.
The radius of a circle is from the middle to the edge, or half the diameter. The circumference is like the perimeter of the circle, and the formula is pi times the diameter.
It looks like an extra large pizza which has a diameter of 18 inches