The area of a four square court is 66 square feet. Estimate the side length, s, to the nearest tenth of a foot

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