For the trapezoid to be proven to be an isosceles trapezoid, the additional information needed is: A. DE ≅ GF
What is an Isosceles Trapezoid?
An isosceles trapezoid is a type of trapezoid whose opposite non-parallel sides have the same side length and base angles that are congruent.
In essence, for trapezoid DEFG to be proven to be an isosceles trapezoid, DE must be congruent to GF.
The additional information needed is therefore: A. DE ≅ GF
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