Diameter = 2 × radius
Diameter = circumference ÷ π
Diameter = √(4 × area ÷ π)
If radius is known, multiply it by 2
If circumference is known, divide it by π
If area is known, multiply the area by 4, divide by π, then take the square root
Diameter = 2 × radius
Diameter = circumference ÷ π
Diameter = √(4 × area ÷ π)
If radius is known, multiply it by 2
If circumference is known, divide it by π
If area is known, multiply the area by 4, divide by π, then take the square root