WAEC Mathematics 2011 Paper

Concept:Vertically opposite angles are equal, and adjacent angles on a straight line add up to $180^\circ$.Explanation:From the diagram, $n$ and $q$ are vertically opposite angles.Therefore, $n = q$, so statement ii is true.Also, $n$ and $p$ are adjacent angles on a straight line, giving $n + p = 180^\circ$.Hence, statement iii is also true.Statements i and iv do not follow from the given angle relations.Answer:C. ii and iii