Special Cases
In an isosceles trapezoid, the legs (AD and BC in the figure above) have the same length, and the base angles have the same measure. In a right trapezoid (also called right-angled trapezoid), two adjacent angles are right angles. A tangential trapezoid is a trapezoid that has an incircle.
Under the inclusive definition, all parallelograms along with the rhombus, the rectangle and the square are also trapezoids.
Read more about this topic: Trapezoid
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