12.wich two quadrilaterals have congruent diagonals?
A. parallelogram and rectangle
B. rectangle and square
C. rectangle and rhombus
D. square and rhombus
13.wich of the following is the definition of a parallelogram?
A. Diagonals bisect each other
B. Both airs od opposite sides are congruent
C. both pairs of opposite are parallel
D. consecutive angles are supplementary​