trapezoid
It could be a right angle triangle
The question does not make any sense. "Adjacent" means next to. A shape cannot be next to itself, and if it is next to another shape, then you have two shapes. "perpendicular" means at right angles (or 90 degrees) to. Again, a shape cannot be perpendicular to itself.
square
The question does not make any sense. "Adjacent" means next to. A shape cannot be next to itself, and if it is next to another shape, then you have two shapes. "perpendicular" means at right angles (or 90 degrees) to. Again, a shape cannot be perpendicular to itself.
It fits the description of a right angle triangle
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shape no pairs of perpendicular sides
A rhombus has parallel lines but no perpendicular lines.
rectangle, square
Square.
square