Answer: The area of the region of dog able to explore is about 1257 square feet.
Explanation:
Given : A dog is leashed to point in the center of a large yard, so the area the dog is able to explore is circular.
i.e. Length of leash = Radius of the circular region of dog able to explore.
The length of leash = 20 feet
i.e. Radius = 20 feet
Formula : Area of circle =


Hence, the area of the region of dog able to explore is about 1257 square feet.