The only option that is true about an Isosceles Trapezoid is; D: The diagonals are congruent
In an isosceles trapezoid, the two sides that are not parallel to each other are usually the same length. Now, this means that a symmetric trapezoid will be created and as such the diagonals would be the same length.
The bases of any trapezoid are parallel and also the diagonals cannot be perpendicular because the 2 non-parallel sides would be slanted.
In conclusion, the correct option is option D.
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