The equation for finding the circumference of a circle is C=2πr.
C= Circumference.
π= Pi (3.14).
r= Radius.
Therefore, C=2π(20), so C=125.66.
Wiki User
∙ 14y agoWiki User
∙ 7y agoThe formula for size and circumference is pi x diameter. Let's work that backwards. If the circumference is 20, divide that by pi (3.14) that will give you the diameter. We know that the radius is half of the diameter, so take the answer you just got, divide by 2, and that will be the radius.
Wiki User
∙ 12y agoThe formula for circumference of a circle is pi * 2 * r
pi = 3.14159
r = 20
C = 2*20*3.14159 = 125.6636
Wiki User
∙ 13y agoC = 2πr
C = 2π * 20
C = 40π or 125.6637 units.
Wiki User
∙ 14y agor=3.18309
Circumference of a circle equals Pi times the double the radius C = 2 x 3.14 x radius C= 2 x 3.14 x 20 C = 125.6 The circumference of a circle with a 20 foot radius is 125.6 feet.
20
Circumference = Pi * diameter. so Circumference = pi * 20 = 62.832
The circumference of a circle if radius is 25 is about 157.1
The circumference of a circle with a 2pi radius is: 39.58
The radius of this circle is 10 units.
The radius of a circle whose circumference is 40pi is 20 units.
Circumference of a circle equals Pi times the double the radius C = 2 x 3.14 x radius C= 2 x 3.14 x 20 C = 125.6 The circumference of a circle with a 20 foot radius is 125.6 feet.
20
radius = 20/(2*pi) = 3.183098862 inches
Circumference = Pi * diameter. so Circumference = pi * 20 = 62.832
Multiply the radius by (2 x pi).
Circumference = 2*pi*r = 125.66 metres
Divide the circumference by (2 x pi).
The circumference of circle with radius 12cm is 75.4cm
The circumference of a circle if the radius is 29 is about 182.21
The radius of a circle with a circumference of 110 is: 17.507