One pair of parallel sides of unequal length, the other two sides being of equal length but not parallel. there are other properties that can be derived from these.
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No, not every trapezoid is an isosceles trapezoid.
An isosceles trapezoid
No, but they are both 4 sided quadrilaterals.
If the two sides which are not parallel have equal lengths, then the trapezoid is called an isosceles trapezoid (standard trapezoid has unequal sides). The base angles in an isosceles trapezoid are equal in measurement, also I know that a trapezoid with two nonparallel sides the same length is called an isosceles trapezoid.
The base angles are congruent in an isosceles trapezoid