That depends what part of the circle the 22 units is the measure of - if this is the perimeter, divide it by pi to get the diameter.
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The circumference is about 22 units.
The circle's diameter is 8.291 units.
A circle with a diameter of 2.5 units has a circumference of 7.9 units.
The diameter of the circle is 11.997 units.
If the area of a circle is 64 square units the diameter is: 9.027 units.