Respuesta :
A trapezoid is isosceles if and only if
(1) The base angles are congruent
(2) The diagonals are congruent
(3) The opposite angles are supplementary
So the description does not guarantee that a trapezoid is isoceles for "Congruent bases".
In an isosceles trapezoid, the bases are not congruent but parallel.
Quadrilateral
A quadrilateral is a polygon with four sides and four angles. Types are square, trapezoid, rectangle and so on.
A trapezoid is a quadrilateral with one pair of parallel sides. An isosceles trapezoid has non-parallel sides and base angles congruent, congruent diagonals and congruent legs.
In an isosceles trapezoid, the bases are not congruent but parallel.
Find out more on Quadrilateral at: https://brainly.com/question/16691874