There could be many different correct answers, such as - <span>A radius of a circle is perpendicular to a chord if and only if it (bisects the minor arc) </span>- A radius of a circle is perpendicular to a chord if and only if it (bisects the major arc) - A radius of a circle is perpendicular to a chord if and only if it (bisects the subtended angle of the chord) - A radius of a circle is perpendicular to a chord if and only if it (bisects the chord)