Question

In fig. lines AB and CD intersects each other at O. If $\angle AOC={30}^o$, find $\angle BOD$.

• A. ${30}^o$
• B. ${150}^o$
• C. ${60}^o$
• D. ${75}^o$

Answer 1

The correct option is A ${30}^o$

$\angle AOC={30}^o$ (given)
$\because \angle AOC$ and $\angle BOD$ are vertically opposite angle
$\therefore \angle AOC=\angle BOD$
$\therefore \angle BOD={30}^o$