Use the formula: diameter = 2 × radius
If you know the radius, multiply it by 2
Use the formula: diameter = circumference ÷ π
If you know the circumference, divide it by 3.14159
If you know the area, use the formula: diameter = 2 × √(area ÷ π)
Use the formula: diameter = 2 × radius
If you know the radius, multiply it by 2
Use the formula: diameter = circumference ÷ π
If you know the circumference, divide it by 3.14159
If you know the area, use the formula: diameter = 2 × √(area ÷ π)