Question

If a radius of a circle bisects a chord which is not a diameter, then ______

Answer 1

Frst, some notation. Let AB be a chord on circle O, and let CD be a diameter of O that passes through AB at M.

Answer 2

the radius is perpendicular to the chord.

Explanation:

The geometry is drawn in the image shown below in which AB is the chorh and O is the centre of the circle. Om is the radius which bisects the chord.(Given) So, AN = NB

From the image, considering ΔAON and ΔBON,

AO = BO (radius of circle)

AN = NB (given)

ON = ON (common)

So,

ΔAON ≅ ΔBON

Hence, ∠ANO = ∠BNO

Also, ∠ANO + ∠BNO = 180° (Linear Pair)

So,

∠ANO = ∠BNO = 90°

Hence, it is perpendicular to the chord.