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 following figure, OA =OC and AB =BC.
Prove that :
(i) ∠ AOB = 900
(ii) Δ AOD ≅Δ COD
(iii) AD =CD
In the given figure, chord AB subtends ∠AOB is equal to 60° at the centre of the circle. If OA=5cm, then length of AB (in cm) is