Version: 5.6
public static Vector2 insideUnitCircle ;

説明

半径 1 の円の内部のランダムな点を返します(読み取り専用)

// Sets the position to be somewhere inside a circle
// with radius 5 and the center at zero. Note that
// assigning a Vector2 to a Vector3 is fine - it will
// just set the X and Y values.
transform.position = Random.insideUnitCircle * 5;