If PQRS is a rhombus, which statements must be true? Check all that apply.
A. PR is perpendicular to QS.
B. (angle) PQR is congruent to (angle) QPS.
C. (angle) PQR is supplementary to (angle)
QPS
D. (line) PR is congruent to (line) QS
E. (line) PT is congruent to (line) RT
F. (line) PS is parallel to (line) QR.

here is a similar rhombus only thing different is the O should be a T
http://images.tutorvista.com/cms/images/67/theorem-on-parallelogram.png

Question

If PQRS is a rhombus, which statements must be true? Check all that apply.
A.	PR is perpendicular to QS.
B.	(angle) PQR is congruent to (angle) QPS.
C.	(angle) PQR is supplementary to (angle)                      
        QPS    
D.    (line) PR is congruent to (line) QS
E.     (line) PT is congruent to (line) RT
F.	(line) PS is parallel to (line) QR.
 
here is a similar rhombus only thing different is the O should be a T
http://images.tutorvista.com/cms/images/67/theorem-on-parallelogram.png