Area of a 20 Centimeter Circle

What is the area of a circle with a DIAMETER of 20 cm (radius of 10 cm)? How big is a 20 centimeter circle?
cm
Area of a 20cm diameter circle
314.16square centimeters
0.031416square meters
48.695square inches
0.33816square feet
0.037573square 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.

Diameter
Circle Area by Diameter
(results are rounded)
Diameter cm2 in2 ft2
20.0 cm 314.2 48.69 0.3382
20.1 cm 317.3 49.18 0.3415
20.2 cm 320.5 49.67 0.3450
20.3 cm 323.7 50.17 0.3484
20.4 cm 326.9 50.66 0.3518
Diameter cm2 in2 ft2
20.5 cm 330.1 51.16 0.3553
20.6 cm 333.3 51.66 0.3588
20.7 cm 336.5 52.16 0.3622
20.8 cm 339.8 52.67 0.3658
20.9 cm 343.1 53.18 0.3693