Once you have shown that two triangles are congruent you can use CPCTC (corresponding parts of congruent triangles are congruent) to show the congruence of the remaining sides and angles.
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congruent
CPCTC or congruent
congruent -Gieco53-
it depends on if all the sides of the rectangle, like a square, fall under CPCTC. if that is accurate, then the diagonals will all be the same :) hopefully this helps! :)
you would use grams