It depends on what other information you have: area, circumference, radius, length of arc subtending a known angle, measure of angle for a known arc length etc.
the equation for the circumference of a circle is 2*radius*pi, or since the radius is half of the diameter 2*radius=diameter, we can simplify the equation to the circumference of a circle=diameter*pi
The radius of a circle = the diameter of the circle divided by 2
The relationship between the circumference ( C ) and the diameter ( d ) of a circle is expressed by the equation ( C = \pi d ), where ( \pi ) (approximately 3.14159) is a constant that represents the ratio of the circumference to the diameter of any circle. This equation indicates that the circumference is directly proportional to the diameter, with ( \pi ) as the proportionality constant.
Well, the equation for finding the circumfrence of a circle is (diameter)(pi). That is diameter times pi. since the diameter of a circle is 2 radii, we can say that there is 2(pi) radii in a circle.
The equation for determining the circumference of a circle is circumference = pi x diameter. So if the diameter is 5, then the circumference is pi * 5 = 15.71
the equation for the circumference of a circle is 2*radius*pi, or since the radius is half of the diameter 2*radius=diameter, we can simplify the equation to the circumference of a circle=diameter*pi
The radius of a circle = the diameter of the circle divided by 2
Diameter = 1/2 of the circle's radius. Diameter = 2 times the square root of (the circle's area/pi) Diameter = the circle's circumference/pi
Circumference ("perimeter") of a circle = (pi) x (diameter of the circle)
The relationship between the circumference ( C ) and the diameter ( d ) of a circle is expressed by the equation ( C = \pi d ), where ( \pi ) (approximately 3.14159) is a constant that represents the ratio of the circumference to the diameter of any circle. This equation indicates that the circumference is directly proportional to the diameter, with ( \pi ) as the proportionality constant.
Well, the equation for finding the circumfrence of a circle is (diameter)(pi). That is diameter times pi. since the diameter of a circle is 2 radii, we can say that there is 2(pi) radii in a circle.
The equation for determining the circumference of a circle is circumference = pi x diameter. So if the diameter is 5, then the circumference is pi * 5 = 15.71
If you are referring to a circle, divide the diameter by 2 (to get the radius), then use the standard equation for the area of a circle. For your reference, this is the equation: area = pi x radius2
circumference of a circle = diameter*pi or 2*pi*radius
If the radius of a circle is 8, then the diameter is 16. The diameter of a circle is two times of a radius The equation would be d = 2r so plugging in 8 for r, the equation would become d = 2(8) Therefore d is 16.
multiple the diameter by 2 to get the radius, then use your equation and go from there
Area of a circle = (pi) (R2)R = radius of the circle = 1/2 of its diameter