and 
, therefore, EFGH is a parallelogram because its parallel sides are congruents (equals).
. The simbol "≅" means congruence, that is, 
is a diagonal of the parallelogram EFGH. When we have a diagonal in a parallelogram, the opposite angles are congruents (look at the picture: the blue angles are congruent and the red angles are congruents too). Therefore, 
and 
.
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Answers: 2
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