It is the triangle which has only 3 sides whereas the rest have 4 sides.
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Which polygon could NOT belong in the shaded portion of the diagram
A.Rhombuses B.Rectangles C.Parallelograms D.Trapezoids
The shape that does not belong with the others is the rectangle. A triangle, rhombus, and trapezoid are all polygons with specific characteristics - a triangle has three sides, a rhombus has all sides of equal length, and a trapezoid has one pair of parallel sides. However, a rectangle is a special type of parallelogram with all angles measuring 90 degrees, making it distinct from the other shapes listed.
Trapezoid. The rectangle, square, and rhombus are all parallelograms. The Trapezoid is a solid: a prism of trapezium cross-section.
A trapezoid and a triangle can make a triangle or another trapezoid, among others.
It can be argued that a rhombus can fit inside a trapezoid. However, there are others who debate that a trapezoid can never be a rhombus because it is defined to have exactly one pair of parallel sides.
If the triangle and hexagon are equilateral, then the trapezoid is not like the others because all of its angles are not equal. A rectangle will have 4 equal right angles. An equilateral triangle will have 3 equal acute 60 degree angles. An equilateral hexagon will have 6 equal obtuse 120 degreeangles.