An isosceles-triangle based prism.
A cube has 3 pairs of congruent rectangle because it is made up of six squares ( squares are special types of rectangles, where all sides are equal ). However, not every rectangle is a square.
Draw a rectangle made with three squares. Then put a diagonal line through the center one. Tah-Dah
A cuboid.
A cube
circle based rectangle
A tetramino is a shape which is formed by four identical squares.
rectangle
...a cylinder...
A cube has 6 square faces
1 rectangle and 2 circle.
In two dimensions, nothing other than a 2*1 rectangle. In three dimensions, a pair of squares at a variable angle between them.
cylinder