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The Definition of Congruent Figures (which is a proof) says that if two figures have corresponding sides congruent and corresponding angles congruent, then the figures are to be congruent.
A rectangular prism has 3 pairs of congruent faces
A rectangle has 4 congruent angles. 90 degrees. It is also a parallelogram, 2 pairs of congruent sides.
A Rhombus.
yes, intersecting lines form two pairs of congruent angles