divide diameter by 2
To find the circumference of a circle the formula is: 2*pi*radius or diameter*pi
Assuming you mean a circle, use the formula for the area of a circle, which is usually expressed in terms of the radius, and solve for the radius. Then you can multiply that by two to get the diameter, since the diameter is twice the radius.
The circumference of a circle is given by the formula C = 2πr where r is the radius. But, as the diameter is 2 x radius then the formula can be written C = πd where d is the diameter. In this example the circumference = 2π3 = 6π = 18.85 units.
The answer depends on what information you are given: volume and radius or diameter, or surface area and radius, etc.
You can use the cosine rule to calculate the central angle.
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
You just multiply the given radius by 2. That is diameter is just double of the radius. This is universal formula.
Circumfrence=diameter X 3.14 (diameter=2 X radius)
To find the circumference of a circle the formula is: 2*pi*radius or diameter*pi
If it is just the radius, it is half of the diameter. If you are given the circumference, divide the given measure value by 3.14. Then, divide the result by 2 to get the radius! Have fun! If you need any help with other math formula's just post another answer. I'll write full, complete, and correct answers that I'm sure about. David (venom751998)
Assuming you mean a circle, use the formula for the area of a circle, which is usually expressed in terms of the radius, and solve for the radius. Then you can multiply that by two to get the diameter, since the diameter is twice the radius.
The circumference of a circle is given by the formula C = 2πr where r is the radius. But, as the diameter is 2 x radius then the formula can be written C = πd where d is the diameter. In this example the circumference = 2π3 = 6π = 18.85 units.
in place of r (radius) write d/2 where d is diameter
Radius is half of the diameter, so you can easily come up with a formula: L = 0.25 * pi * d2
The answer depends on what information you are given: volume and radius or diameter, or surface area and radius, etc.
the radius is half the diameter
The radius is half the diameter.