Area of a 40 Foot Circle

What is the area of a circle with a DIAMETER of 40 feet (radius of 20 feet)? How big is a 40 foot circle?

Diameter

meters

Diameter

yards

Units

Area of a 40′ diameter circle

results may be rounded

The area of a circle is pi times the square of its radius. The radius is half the diameter.

Area = π * (Diameter / 2)²

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	ft²	in²	m²
40′0″	1,257	181,000	116.7
40′1″	1,262	181,700	117.2
40′2″	1,267	182,500	117.7
40′3″	1,272	183,200	118.2
40′4″	1,278	184,000	118.7
40′5″	1,283	184,700	119.2
40′6″	1,288	185,500	119.7
40′7″	1,294	186,300	120.2
40′8″	1,299	187,000	120.7
40′9″	1,304	187,800	121.2
40′10″	1,310	188,600	121.7
40′11″	1,315	189,300	122.2