Answer: the circumference is the perimeter of a circle or ellipse. That is, the circumference would be the arc length of the circle, as if it were opened up and straightened out to a line segment. More generally, the perimeter is the curve length around any closed figure.
2/9 divided by 1/2. invert the second fraction and multiply
2/9 * 2/1 = 4/9
21080000.00
Hope it helped
