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A scalene triangle
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.
The definition of a scalene triangle is: A three-sided figure (triangle) with no two sides equal.
There is no way to know.If two opposite sides are parallel and of equal length, then the quadrilateral is a parallelogram (rectangle, rhomboid, square, or rhombus).
A square has all 4 sides equal in length. A four sided closed figure with all sides different length is called a quadrilateral.