Question

The question in which two equal chords are given and to find angle abc

Answer 1

Answer:

Triangle AOB as two sides with the same length, [AO] and [OB]. Thus the angles OAB and OBA, opposite, are equals. Since angle AOB=70 degrees, the other two are half the remaining, 55 degrees.

Answer 2

Answer:

Consider the triangles ΔAOB and ΔCOD,

OA = OC and OB = OD (Since they are the radii of the circle)

AB = CD (As given in the question)

So, by SSS congruency, ΔAOB ≅ ΔCOD

∴ By CPCT we have,

∠AOB = ∠COD. (Hence proved).