The real line is a one dimensional object and so cannot contain any rectangular regions. The answer to the question, therefore, is Φ, the empty or null set.
A headstone can be a rectangular pyramid.
corners of most buildingssides of picture framessides of rectangular windowscorners of kitchen refrigerators and stoves
One of the examples of a real-life pyramid is the Great Pyramid of Giza.
any box of tampons
A foreign brick.
The Real line.
It is any real line.
The equator is an imaginary line in the real world
it is a line that is real
like those of a rectangular window
A solid brick is a rectangular prism. (this one example of many)
find