The Great pyramid of Giza has 8 sides not 4!!

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You may know that a pyramid has 4 faces ( excluding the base ) and the pyramid of Giza has been the popular exemplar for a pyramid.

But, the great pyramid has 8 faces ( excluding the base ), not 4!! 

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                                   PC: The History Channel

In his book The Egyptian Pyramids: A Comprehensive, Illustrated Reference, J.P. Lepre wrote:

One
very unusual feature of the Great Pyramid is a concavity of the core
that makes the monument an eight-sided figure, rather than four-sided
like every other Egyptian pyramid. That is to say, that its four sides
are hollowed in or indented along their central lines, from base to
peak.

This concavity divides each of the apparent four sides in half,
creating a very special and unusual eight-sided pyramid; and it is
executed to such an extraordinary degree of precision as to enter the
realm of the uncanny. For, viewed from any ground position or distance,
this concavity is quite invisible to the naked eye.

The hollowing-in can
be noticed only from the air, and only at certain times of the day.
This explains why virtually every available photograph of the Great
Pyramid does not show the hollowing-in phenomenon, and why the concavity
was never discovered until the age of aviation.

It was discovered quite
by accident in 1940, when a British Air Force pilot, P. Groves, was
flying over the pyramid. He happened to notice the concavity and
captured it in the now-famous photograph. [p. 65]

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                              Satellite image of the Great Pyramid.

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Were the pyramids built this way on purpose or did it turn out this way over time is something that still requires a much deeper investigation.

**  The Great Pyramid of Giza has 8 Side [Video]