A square
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.
A rectangle. The opposite sides at least must be equal if all four angles are 90o.
Rectangle
A polygon with 4 sides has 4 angles. All polyhedra have at least 4 vertices so I cannot think of any shape that meets the requirements.
A shape with 4 right angles and 4 equal sides is a square. ==========================
A square
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.
A rectangle. The opposite sides at least must be equal if all four angles are 90o.
Rectangle
A polygon with 4 sides has 4 angles. All polyhedra have at least 4 vertices so I cannot think of any shape that meets the requirements.
A rectangle has 4 sides not the same length and 4 right angles.
A rectangle
A RECTANGLE has 4 sides and 4 right angles.
a triangle=======================an equilateral triangle
An irregular shape
A Square # a square