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What is the circumference of an 8 inch diameter circle?
##C=8pi##
Just use this: ##C=2piR## The diameter is 8 and the radius is a half of the diameter, so the radius is 4
##C=Circunference## ##pi~=3.14## ##R=radius##
##C=2times3.14times4##
##color(brown)(C~=25.12##
Or you can answer with ##pi## as a multiplicative constant: ##color(red)(C=8pi##