Question

If a trapezoid has one pair of congruent base angles, then it is (a trapezoid, isosceles trapezoid).
GPT-4o mini
If a trapezoid has one pair of congruent base angles, then it is an **isosceles trapezoid**. This is because, in an isosceles trapezoid, the non-parallel sides (legs) are equal in length, and the base angles adjacent to each base are equal.

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