AB and CD are two equal chords of a circle with centre O such that ∠AOB = 80°, then ∠COD = ?
Given: 
AB = CD
We know that angles subtended from equal chords at center are equal.
∴ ∠ AOB = ∠ COD
∴ ∠ COD = 80°
7
AB and CD are two equal chords of a circle with centre O such that ∠AOB = 80°, then ∠COD = ?
Given:
AB = CD
We know that angles subtended from equal chords at center are equal.
∴ ∠ AOB = ∠ COD
∴ ∠ COD = 80°