How To Calculate The Radius Of A Circle?

Radius = Diameter ÷ 2

Radius = Circumference ÷ (2π)

Radius = √(Area ÷ π)

Radius = √(Chord² ÷ 4 + Sagitta²) − Sagitta

Radius = Side ÷ (2 sin(central angle ÷ 2))

Radius = Perimeter ÷ (2π)