Quadrilateral ABCD is a trapezoid with AB || CD. What must be shown to prove that ABCD is an isosceles trapezoid?

A.The base angles are congruent.
B.The opposite angles are congruent.
C.The diagonals are perpendicular.
D.AD || BC

ill post the pic in a sec

Question

Quadrilateral ABCD is a trapezoid with AB  || CD. What must be shown to prove that ABCD is an isosceles trapezoid?

A.The base angles are congruent.
B.The opposite angles are congruent.
C.The diagonals are perpendicular.
D.AD || BC


ill post the pic in a sec

anonymous · Answer

http://media.education2020.com/evresources/2091250_92dde978-dbb0-409f-ba06-7e9358ecaec6.png

directrix · Answer

Theorem:

If the base angles of a trapezoid are congruent, then the trapezoid is an isosceles trapezoid.

Use that to choose the correct option.

directrix · Answer

@adamgamer

anonymous · Answer

@Directrix  so A?

directrix · Answer

That is what I think is the answer based on the theorem.  Yes.