Mathematics for IGCSE & O level - Circle Theorems (Section 2 - No. 34)
If a line segment from the center of a circle bisects a chord (but isn't a radius), what's the relationship between the line segment and the chord?
They are parallel.
They are perpendicular.
They have the same length.
They are unrelated.
Объяснение
If a line segment from the center bisects a chord, it's perpendicular to the chord.