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ABDC is an isosceles trapezoid. Given only the choices below, which properties would you use to prove ACD ≅ BDC by SSS?

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LearnGrow
If the choices are the following:
The legs are congruent.
The base angles are congruent.
The bases are | |.
The diagonals are congruent.
Then , to prove ACD ≅ BDC by SSS I would use The base angles are congruent. 
This is sufficient to prove the triangles are congruent.