The radius of the inner circle is 14 ft. Since the outer circle is 3 ft more than the inner circle, its radius is 17 ft. The circumference formula is 2(pi)radius (or 2(22/7)17 in this case). The circumference of the outer circle is 106.85 ft (or 106.9 if rounding). To find the difference, you would subtract the smallest FROM the greatest:
The circumference of the outer circle is 62.88 feet greater than the circumference of the inner circle.
Explanation:
Since the distance between the inner and outer circle is 4 ft, that means 4 is the radius. Circumference = pi2r. This means that the circumference of the outer circle is (3.14 x 2 x 4), which would give us 25.12 ft. Then, we can subtract. 88 ft - 25.12 ft would give us 62.88 ft, which is how many feet greater the outer circle is. Hope this helps!
