0.28
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Yes, one half of 25 is 12.5
The diameter of a circle with a circumference of 25 inches is: 78.54 inches. (d = c divided by Pi).
Half the diameter then multiply the radius (your new measurement) by itself. E.g Diameter is 10 what is the area? 10 divided by 2 is 5 which is the radius. Multiply the 5 by itself. 52=25 then multiply the squared radius (25) by Pi.
25
25.5