a hexadecagon has 16 sides.
Squares, rectangles and rhombuses are all parallelograms. A parallelogram is a shape with opposite sides being parallel and exact in length, and opposite angles are equal. Example, a square, all sides are equal and opposite angles are also equal.
a square or a parallelogram
A congruent shape is a shape with all of its sides equal length.
Any regular shaped polygon has equal angles and equal sides
A hexagon has all six sides in equal length and all angles in equal measure.
A square is a four-sided shape with all sides equal and all angles equal.
Its a diamond :]
No shape has four equal sides and four different angles - either there are two pairs of equal angles, or all four angles are the same; or all sides are not the same length.
its a rhombus