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a Rhombus...
No sides perpendicular means no right angles. A rhombus is a quadrilateral with no right angles so no sides perpendicular.
The following shape has three sides and the only angles are right angles. ----- | |___
Five side is always a pentagon, but there's no pentagon that always has exactly one right angle. A regular pentagon has no right angles. An irregular pentagon can have one, two, or three right angles, or none.
a shape with 5 sides and 2 right angles is or are a pentagon so the answer is a pentagon