In the given figure, A B C D. If ∠ A O C=30^∘ and ∠ O A B=100^∘ then ∠ O C D= ? (a) 130^∘ (b) 15...

In the given figure, A B C D. If ∠ A O C=30^∘ and ∠ O A B=100^∘ then ∠ O C D= ?
(a) 130^∘
(b) 150^∘
(c) 80^∘
(d) 100^∘

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