Math
posted by sl on .
Are these quadrilaterals parallelograms?
(quadrilateral ABCD with diagonals intersecting at E)
1. AB is congruent to AD and AB is parallel to DC
2. AB and DC are congruent and parallel
3. DE and BE are congruent

A parallelogram is a quadrilateral with
its opposite sides parallel and equal.
The opposite angles are also equal.
1. Yes.
2. Yes.
3. Yes.