Answer with explanation:
Circumference of a circle = If you start running from a point and return to that point Such that the shape formed is similar to shape of the Wheel or Tyre of a car or Bicycle or the shape when you look at the sun from the earth surface,then the total distance covered,as displacement is Zero, is called circumference of circle.The Mid point of this shape is known as Center and distance from mid point of the shape to a point on the circle is called Radius of the circle.
The total Circumference of any Circle is equal to 2 π r, where r,is radius of that circle and π is a fixed constant , an irrational number=3.14.....
→ If Radius =12 inches
Circumference =2 π r
=2 ×π×12
= 24 π inches
→If Diameter = 12 inches
Radius
Radius =6 inches
Circumference =2 π r
=2 ×π×6
= 12 π inches