Circumference = n (pi) x diameter
The diameter always equals 2 x radius.
So the diameter of this circle is 5. Multiply by pi.
5 x 3.142.. = 15.7 to the nearest decimal place
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The circumference of a circle if radius is 25 is about 157.1
157.079632679 :) you have to do the radius x 2 then times that by pi!
Not sure about raids, but the radius is 3.98 units.
Circumference of a circle = 2*pi*radius Circumference = 2*pi*25 =157.0796327 inches or 157 inches correct to three significant figures.
The circumference of a circle is twice the radius times PI [2*pi*r] with r = 4 >> about 25