In a circle with centre O, chords AB and CD are equal in length. The chord AB subtends a central angle ∠AOB=(6x+12)∘. The chord CD subtends an angle ∠CED=(4x−8)∘ at a point E on the circumference.
(i) Find the value of x.
(ii) Hence, determine the measure of ∠AOB.
a. (i) Value of x
b. (ii) Measure of ∠AOB