how many major pyramids are located at giza Cairo in Egypt

The Egyptian pyramids are pyramid shaped structures located in Egypt, and were built as a tomb for dead kings called pharaohs.They were also built for noblemen. There are over 100 Egyptian pyramids, most of which were built during the Old and Middle Kingdom periods. The first Egyptian pyramid was the Pyramid of Djozer which was built during the third dynasty under King Djozer. The pyramid was designed by Imhotep as a tomb for the King. The best known Egyptian pyramids are the Giza pyramids which are recognized among the largest structures ever built and are the only remaining monuments of the Seven Wonders of the Ancient World.
picture (c) Author MesserWoland from wiki
Giza is the location of the Pyramid of Khufu (also known as the "Great Pyramid" and the "Pyramid of Cheops"); the somewhat smaller Pyramid of Khafre (or Kephren); the relatively modest-sized Pyramid of Menkaure (or Mykerinus), along with a number of smaller satellite edifices known as "Queen's pyramids"; and the Great Sphinx.
Of the three, only Khafre's pyramid retains part of its original polished limestone casing, near its apex. This pyramid appears larger than the adjacent Khufu pyramid by virtue of its more elevated location, and the steeper angle of inclination of its construction — it is, in fact, smaller in both height and volume.
The Giza Necropolis has been a popular tourist destination since antiquity, and was popularized in Hellenistic times when the Great Pyramid was listed by Antipater of Sidon as one of the Seven Wonders of the World. Today it is the only one of those wonders still in existence.
info (c) http://en.wikipedia.org/wiki/Egyptian_pyramids#Giza