Since it's a square court, all sides are equal, so we can square one side to find the area. S²=A
We know the area (66 ft²) but not the length of one Side... Enter our known value, and take the square root of both sides: S²=66 √S²=√66 S=√66 S≈8.12403.....round to the nearest tenth: S=8.1 ft