If quadrilateral ABCD is an isosceles trapezoid, which statements must be true? Choose three correct answers.

In an isosceles trapezoid, the bases are parallel, so BC is parallel to AD. Its legs are congruent, so BA is congruent to CD. The base angles at B and C are also congruent, giving ∠CBA ≅ ∠BCD. The diagonals do not generally bisect each other or meet at right angles, so the statements about BE and ED and perpendicular diagonals need not be true.

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