Given rectangle efgh, which statement accurately completes the proof that efgh is a parallelogram? statement justification angles hef, efg, fgh, and ghe are congruent definition of a rectangle angles hef and efg are supplementary definition of supplementary angles ef and gh are parallel same side interior angles theorem angles efg and fgh are supplementary fg and eh are parallel same side interior angles theorem ef is congruent to gh definition of a rectangle fg is congruent to eh definition of a rectangle efgh is a parallelogram definition of a parallelogram