it is called a CUBOID
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In order to find the perimeter of a 3D rectangle you must gather the lengths of the known sides, calculate the missing rectangular values, and use the formula for perimeter.
Rectangles do not have congruent lines. A square can always be called a rectangle. But a rectangle can't always be a square.
Dodecahedron.
A rectangle, possibly a square. Can you see why a parallelogram must be a rectangle if any one of its angles is right?
A rectangle is a good, simple shape to begin with. The area of a rectangle is equal to the product of the length of its base and the length of its height. The height is a segment that is perpendicular to the base. For a rectangle, the base and height are often called the "length" and the "width", and sometimes the height is referred to as the "altitude."