How much canvas is needed to cover the bottom of a tent if the center pole is 7ft from the edge?

The area (A) of a circle with radius r is given by

... A = π·r²

For a radius of 7 ft, the area is

... A = π· (7 ft) ² = 49π ft² ≈ 154 ft²

The area of the bottom of a circular tent with radius 7 ft is about 154 ft².