Area of a 18 Foot Circle

What is the area of a circle with a DIAMETER of 18 feet (radius of 9 feet)? How big is a 18 foot circle?
ft
in
Area of a 18′ diameter circle
254.47square feet
36,644square inches
28.274square yards
0.0058418acres
23.641square meters
236,409square centimeters
0.0023641hectares
(results may be rounded)

Area of a Circle Formula

The area of a circle is pi times the square of its radius. The radius is half the diameter.

Area = π * (Diameter / 2)2

Diameter of a Circle

The diameter of a circle is the distance from one edge to the other, passing through the center. It is twice the radius.

Diameter
Circle Area by Diameter
(results are rounded)
Diameter ft2 in2 m2
18′0″ 254.5 36,644 23.64
18′1″ 256.8 36,984 23.86
18′2″ 259.2 37,325 24.08
18′3″ 261.6 37,668 24.30
18′4″ 264.0 38,013 24.52
18′5″ 266.4 38,360 24.75
Diameter ft2 in2 m2
18′6″ 268.8 38,708 24.97
18′7″ 271.2 39,057 25.20
18′8″ 273.7 39,408 25.42
18′9″ 276.1 39,761 25.65
18′10″ 278.6 40,115 25.88
18′11″ 281.0 40,471 26.11