WAEC Mathematics 2017 Paper

Concept:A parallelogram is a quadrilateral where both pairs of opposite sides are parallel and equal in length.Explanation:One key property of a parallelogram is that its opposite angles are equal in measure.For example, if one angle is $60^\circ$, the angle directly opposite it is also $60^\circ$.The other pair of opposite angles will also be equal to each other.Adjacent angles in a parallelogram are supplementary, meaning they add up to $180^\circ$.However, opposite angles are supplementary only in a special case, such as a rectangle, where every angle is $90^\circ$.Opposite angles are not complementary in general, because complementary angles add to $90^\circ$.Opposite angles of a parallelogram are never reflex angles, since each angle is less than $180^\circ$.Answer:C. opposite angles are equal