Answer: 66 yards of fence
Explanation:
This is a circular enclosure so the length of the fence must be the circumference of the circular enclosure.
The fence was built 10.5 yards from the centre which would mean that 10.5 yards is the radius of the circle.
The circumference will therefore be:
= 2 * Pie * radius
= 2 * 22/7 * 10.5
= 66 yards of fence