Mathematics for IGCSE & O level - Circle Theorems (Section 1 - No. 4)
What can you say about the perpendicular from the centre of a circle to a chord?
It bisects the chord and is parallel.
It is longer than the radius.
It bisects the chord and is perpendicular.
It is the same length as the radius.
Giải thích
The perpendicular bisects the chord at right angles.