(i) In the given figure, if ∠AOB = 90° and

∠ABC = 30°, then find the measure of ∠CAO.

(ii) If ABCD is a cyclic quadrilateral such that AB is a diameter of the circle circumscribing.it and ∠ADC = 140°, then find ∠BAC.

∠ABC = 30°, then find the measure of ∠CAO.

(ii) If ABCD is a cyclic quadrilateral such that AB is a diameter of the circle circumscribing.it and ∠ADC = 140°, then find ∠BAC.