If you know the diameter of a circle, multiply that by pi (approximately 3.14). If you know the radius, multiply it by 2 x pi.
The equation of a circle centered at the origin is x2 + y2 = r2; in this case, x2 + y2 = 64.The equation of a circle centered at the origin is x2 + y2 = r2; in this case, x2 + y2 = 64.The equation of a circle centered at the origin is x2 + y2 = r2; in this case, x2 + y2 = 64.The equation of a circle centered at the origin is x2 + y2 = r2; in this case, x2 + y2 = 64.
If you mean: (x+9)^2 + (y+5)^2 = 64 Then the center of the circle is at (-9,-5) and the radius is 8
Area = pi*r2 = 64*pi so that r2 = 64 or r = 8 Then circumference = 2*pi*r = 16*pi
If the circumference is 128 feet, the radius is 20.37 feet. If the diameter is 128 feet, the radius is 64 feet.
That's the equation of a circle with its center at the origin and a radius of 8.
the distance around a circle
Multiply the diameter of a circle by 3.14.
Multiply the diameter by 'pi' .
If the circle's circunference is 128 then radius is 128/2pi = about 20.372 inches
The value of pi is the relationship of a circunference to its diameter. For instance, if you have a circle whose circunference is 9.42477 cm, you shall have a diameter of 3 cm. Any measure of a circunference divided by its diameter shall generates the same numeric value, the pi number.
The circumference of the circle with a diameter of 64 mm is 64*pi = about 201 mm
π is the ratio between the diameter and the circumference of a circle so the formula would be : Circumference = π x Diameter or alternatively (since the radius is half the diameter) Circumference = 2π x Radius.
That will depend on whether the 64 inches is the radius, diameter, or circumference of the circle.
Pi ( π ) is the ratio of any circle' s circunference to its diameter.It's an endless number, so usually it is rounded to 3.14.So, to calculate a circunference's length, you have to do:(Diameter)x(Pi (consider it as 3.14))=(Perimeter)Here are some more digits of the Pi:3.14159265358979323846Check more about it on the realted links.
The area of a circle is (pi)(r^2). Set this equal to 64 and solve for the radius. r = sqrt(64/pi)
Radius of circle: square root of (64/pi) = 4.5135166683 feet
If the area of a circle is 64 square units the diameter is: 9.027 units.