The answer depends on what the shape is and what information (diameter, circumference, area, volume, analytical equation, etc) is available.
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The radius (not raduis) is 1.25 cm.
The radius (not raduis!) is 3.183 cm, approx.
If the diameter is 9 units then the radius (not raduis) is 4.5 units.
If the radius (not raduis) is 25 feet then the diameter is 50 feet.
A radius (not raduis) of 15 units implies a circumference of 94 units.