If you are given the radius of the circle, you can use the formula:
diameter = 2*radius
If you are given the circumference of the circle, you can use the formula:
diameter = circumference/pi
radius times two
Divide the circumference by pi, and that will give you the diameter. Then take half of the diameter (the radius), and plug it into the formula for the area of a circle (A=πr²)
Circumference of a circle is (pi * diameter). Area of a circle is (pi * r2).
Circumference = pi*d where d is the diameter.
The radius is 1.5. The formula to get the radius is Diameter/2.
The diameter of a circle is twice its radius, or 2r.
The formula for the circumference of a circle is the same, whatever its diameter. Circumference = pi*diameter.
pi*diameter = circumference Rearrange the formula so as the diameter is the subject of the formula: diameter = circumference/pi diameter = 7/pi = 2.228169203
Formula: diameter = pi / circumference
The formula for the area of a circle is pi x radius2. The radius is half the diameter, and the diameter of an inscribed circle is the same as the length of a side of the square.The formula for the area of a circle is pi x radius2. The radius is half the diameter, and the diameter of an inscribed circle is the same as the length of a side of the square.The formula for the area of a circle is pi x radius2. The radius is half the diameter, and the diameter of an inscribed circle is the same as the length of a side of the square.The formula for the area of a circle is pi x radius2. The radius is half the diameter, and the diameter of an inscribed circle is the same as the length of a side of the square.
The formula to find the circumference of a circle is C = πd, where d is the diameter. Using this formula, the circumference of a circle with a diameter of 18 in is C = π × 18 = 56.52 in.
The formula for the circumference of a circle is pi * diameter or (2 radius.)
To calculate this you will need the diameter of the circle. The formula is: diameter/2*pi If you don't know the diameter you can also use the area of the circle: Sqrt(Area/pi) = radius
PI times the DIAMETER
A(Circle)=Pi*Diameter^2 ^2 = squared or to the 2nd power
circumference of a circle = pi * diameter.
diameter = circumference / pi diameter = radius * 2