In the given figure, AOB is a diameter of a circle and CD||AB. If ∠BAD=30∘ then ∠CAD=?
(a) 30∘
(b) 60∘
(c) 45∘
(d) 50∘
In the given figure, OA = OC and AB = BC.
then,∠AOB=90∘
State whether the above statement is true or false.