A regular triangle, pentagon, heptagon, nonagon, etc
ie Any regular polygon with an odd number of sides.
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Trapizium
The adjoining sides are not parallel, they are perpendicular; forming right angles.
No, it does have 3 sets of parallel sides though.
A rhombus (4 congruent sides, diagonals perpendicular)that is not also a square (no right angles), andis also a parallelogram (opposite sides parallel and congruent, opposite angles congruent). It is also a quadrilateral, which has 4 sides.
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