In the figure below, lines AB and CD intersect each other at point O. If the angle ∠AOD=110∘ then, ∠AOC is
80∘
100∘
70∘
110∘
Here ∠AOD+∠AOC=180∘ [COD is straight line, Linear Pair]
∴110∘+∠AOC=180∘
⇒∠AOC=180∘−110∘
⇒∠AOC=70∘