Because of its right angles.
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A rectangle, but it is technically a rectangular prism.
A 3 sided shape is a triangle. A 4 sided shape could be a square or rectangle.
Rectangle.
A rectangle is a shape with 4 sides and for right angles. A rectangle can be called a square. A square, on the other hand, has 4 EQUAL sides and 4 right angles. Therefore, a square cannot be called a rectangle since the rectangle has UNEQUAL sides.
If each angle is 90 degrees the shape is called a square.