To find this, you must use the area of a circle. The radius is the length of the dog's leash, so the formula would be pi or 3.14( 20^2). You would get 400pi in terms of pi or 1256 in normal terms. however the house takes up 1/4 of the circle, so you must multiply that by 3/4 and get your final answer of 942 square ft of running space
