# Area of a 100 Centimeter Circle

What is the area of a circle with a DIAMETER of 100 cm (radius of 50 cm)? How big is a 100 centimeter circle?
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Area of a 100cm diameter circle
 7,854.0 square centimeters 0.78540 square meters 1,217.4 square inches 8.4540 square feet 0.93933 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
100.0 cm 7,854 1,217 8.454
100.1 cm 7,870 1,220 8.471
100.2 cm 7,885 1,222 8.488
100.3 cm 7,901 1,225 8.505
100.4 cm 7,917 1,227 8.522
100.5 cm 7,933 1,230 8.539
100.6 cm 7,949 1,232 8.556
100.7 cm 7,964 1,234 8.573
100.8 cm 7,980 1,237 8.590
100.9 cm 7,996 1,239 8.607