Mathematics for IGCSE & O level - Circle Theorems (Section 3 - No. 4)
Consider a circle with center O. Chord AB is perpendicular to radius OC. What is the relationship between OC and AB?
OC bisects AB.
OC is parallel to AB.
OC is shorter than AB.
OC is a tangent to the circle.
Explication
A radius that is perpendicular to a chord bisects the chord.