there's no such thing. "quad" means four, "lateral" means side. A quadrilateral must and always had only FOUR SIDES! however, a shape with three sides is a triangle.
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Its 4th side would have to be circular in order to comply with the given requirements.
A rhombus, an equal sided parallelogram or an equal sided quadrilateral with no right angles.
Many different types of quadrilaterals can have three equal side lengths. as long as it is a closed shape that has four sides, it is considered a quadrilateral, but not all quadrilaterals have names. A triangle with three equal side length would be called an equilateral triangle.
No. A kite is a quadrilateral (4 sided figure) with two pairs of adjacent sides of equal length; its diagonals are perpendicular. A triangle has 3 sides.
A tri-lateral pyramid, also known as a regular tetrahedron.