isosceles triangle is a 3-sides triangle
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No, not every trapezoid is an isosceles trapezoid.
No. A parallelogram by definition has two pairs of parallel sides. A trapezoid by definition has only one pair of parallel sides.
An isosceles trapezoid
Nope A square is a parallelogram By definition a trapezoid is a quadrilateral with only one pair of sides parallel
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.