**Great Pyramid of Giza**

The Great Pyramid of Giza or Khufu or Cheops, constructed
c. 2580–2560 BC, is the oldest and
largest of the three pyramids in the
Giza Necropolis bordering what is now El
Giza, Egypt.
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**
Golden rectangle**

A golden rectangle
is a rectangle whose side lengths are in the golden ratio,
one-to-phi, that is, approximately 1:1.618. A distinctive
feature of this shape is that when a square section is
removed, the remainder is another golden rectangle, that is,
with the same proportions as the first. Square removal can
be repeated infinitely, which leads to an approximation of
the golden or Fibonacci spiral.