In the given figure, O is the centre of a circle and ∠OAB=50∘, Then, ∠BOD=?
(a) 130∘
(b) 50∘
(c) 100∘
(d) 80∘
In ΔABC, BC = AB and ∠B=80∘. Then, ∠A=?(a) 50∘ (b) 40∘ (c) 100∘ (d) 80∘