One is a three-sided figure with two sides of equal length; the other is a four-sided figure with one pair of parallel sides.
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An isosceles triangle has to have two sides of equal length. An isosceles triangle has to have two sides of equal length.
An isosceles triangle has two equal sides and one that isn't. A regular triangle has three equal sides.
An isosceles triangle has two equal side; a scalene triangle has no two equal sides.
An isosceles triangle has two (or more) sides of equal length, while a scalene triangle has no correlation between side lengths/angle size.
An equilateral triangle has all sides equal and an isosceles has only two sides equal.