Question

12.1: Equal chords of a circle subtend equal angles at the centre​

Answer 1

Answer:

A circle is a collection of points whose every every point is equidistant from the centre. Thus, two circles can only be congruent when they the distance of every point of the both circle is equal from the centre. Thus, ∠AOB = ∠COD by CPCT. Equal chords of congruent circles subtend

Answer 2

Answer:

AB=CD (Given)

AO=CO (radius)

OB=OD (radius)

By S.S.S congruency, ΔAOB≅ΔCOD

⇒∠AOB=∠COD.

hope it helps ☺️!!