Wolfram Alpha says: area of an NFL football field in square meters: 5351m^2 area of a circle of radius 45 meters: 6361.73m^2 area of a tennis singles co

Wolfram Alpha says: area of an NFL football field in square meters: 5351m^2 area of a circle of radius 45 meters: 6361.73m^2 area of a tennis singles court in square meters: 196.7m^2 area of a circle of radius 6.5 meters: 133m^2 It's pretty close. (A volleyball court would be closer at 162m^2.)