Area of a 18 Inch Circle
What is the area of a circle with a DIAMETER of 18 inches (radius of 9 inches)? How big is a 18 inch circle?
Diameter
cm
Diameter
ft
in
Diameter
meters
Diameter
yards
Units
Area of a 18″ diameter circle
| 254.47 | square inches |
| 1.7671 | square feet |
| 0.19635 | square yards |
| 1,641.7 | square centimeters |
| 0.16417 | square meters |
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.