Diameter = 2 × radius
Diameter = circumference ÷ π
Diameter = square root of (4 × area ÷ π)
If the radius is known, multiply it by 2
If the circumference is known, divide it by π
If the area is known, use the formula diameter = √(4A/π)
Diameter = 2 × radius
Diameter = circumference ÷ π
Diameter = square root of (4 × area ÷ π)
If the radius is known, multiply it by 2
If the circumference is known, divide it by π
If the area is known, use the formula diameter = √(4A/π)