# Area of a 9 Centimeter Circle

What is the area of a circle with a DIAMETER of 9 cm (radius of 4.5 cm)? How big is a 9 centimeter circle?
Diameter
cm
Diameter
ft
in
Diameter
meters
Diameter
yards
Units
Area of a 9cm diameter circle
 63.617 square centimeters 0.0063617 square meters 9.8607 square inches 0.068477 square feet 0.0076086 square yards
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.

Circle Area by Diameter
results may be rounded
Diameter cm2 in2 ft2
9.0 cm 63.62 9.861 0.06848
9.1 cm 65.04 10.08 0.07001
9.2 cm 66.48 10.30 0.07155
9.3 cm 67.93 10.53 0.07312
9.4 cm 69.40 10.76 0.07470
9.5 cm 70.88 10.99 0.07630
9.6 cm 72.38 11.22 0.07791
9.7 cm 73.90 11.45 0.07954
9.8 cm 75.43 11.69 0.08119
9.9 cm 76.98 11.93 0.08286