Posted by sl on Saturday, December 8, 2012 at 3:26pm.
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

Math  Henry, Monday, December 10, 2012 at 4:35pm
A parallelogram is a quadrilateral with
its opposite sides parallel and equal.
The opposite angles are also equal.
1. Yes.
2. Yes.
3. Yes.