An engineer is studying these plans for the support beams of a bridge. If SDMT and RTNP are congruent parallelograms, which statements are true?
1) SDMT and RTNP have equal side lengths
2) SDMT and RTNP have equal angles
3) SDMT and RTNP have equal diagonals
4) SDMT and RTNP have equal perimeters
