From $\angle ABO = \angle CDO$ being alternate angles, it follows that—

Question

Accepted Answer

$AB$ and $CD$ are parallel and equal

Answer

$AB \perp CD$

Answer

$AC = BD$

Answer

$	riangle ABC$ is right-angled

From ∠ABO=∠CDO\angle ABO = \angle CDO∠ABO=∠CDO being alternate angles, it follows that—