One has three sides, the other has two.
Both have one pair of congruent sides.
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An isosceles triangle and a isosceles trapezoid.
isosceles triangle is a 3-sides triangle
An isosceles triangle and an isosceles trapezoid are two of them.
It only has two equal lengths out of however many sides like an isosceles triangle
In a general trapezium, the non-parallel sides are not congruent. However, in an isosceles trapezium, the non-parallel sides are congruent. So the shape is like an isosceles triangle with its apex chopped off by a straight line parallel to its base.