From the given figure, AB and CD are chords.
Given:
AB=CD∠AOB=70°
The angle subtended by the chord AB is
∠AOB, and the angle subtended by the chord CD is
∠COD=x.
We know that, equal chords subtend equal angles at the centre.
⇒∠AOB=∠COD=x
Thus,
x=70∘.