Manny uses a sprinkler system to water his lawn. Each lawn sprinkler sprays a distance of 8 feet in every direction. One lawn sprinkler is broken and is only spraying 3/4 of the area it usually covers. How many square feet of the yard is being watered by the broken sprinkler? Leave the answer in terms of pi.
a. 192 square feet
b. 48 square feet c. 12 square feet
d. 6 square feet