Area of a 40 Centimeter Circle

What is the area of a circle with a DIAMETER of 40 cm (radius of 20 cm)? How big is a 40 centimeter circle?
cm
Area of a 40cm diameter circle
1,256.6square centimeters
0.12566square meters
194.78square inches
1.3526square feet
0.15029square 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
40.0 cm 1,257 194.8 1.353
40.1 cm 1,263 195.8 1.359
40.2 cm 1,269 196.7 1.366
40.3 cm 1,276 197.7 1.373
40.4 cm 1,282 198.7 1.380
Diameter cm2 in2 ft2
40.5 cm 1,288 199.7 1.387
40.6 cm 1,295 200.7 1.394
40.7 cm 1,301 201.7 1.400
40.8 cm 1,307 202.6 1.407
40.9 cm 1,314 203.6 1.414