we know that
m∠EDF=°------> by central angles
m∠FDG=°------> by central angles
m∠EDH=°------> by central angles
m∠GDH=°------> by central angles
so
The congruent angles are
m∠EDF=m∠FDG
m∠EDH=m∠GDH
therefore
the answer is
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