~~~~Pyramids~~~~
Unknown "elçinnnnnn" Peppy - 16 years, 8 months, 2 days ago

A pyramid is any three-dimensional polyhedron where the faces other than the base are triangular and converge on one point, called the apex. The base of a pyramid can be any polygon but is typically a square, leading to four non-base faces.

A pyramid is said to be regular if its base is a regular polygon and its upper faces are congruent isosceles triangles.

Cutting off the top of a pyramid, using a plane parallel to the plane of the base, leaves a frustum of a pyramid, sometimes called a flat-topped pyramid, though it no longer satisfies the definition of a pyramid.
Unknown "elçinnnnnn" Peppy - 16 years, 8 months, 2 days ago

China

There are many flat-topped pyramids in China. The First Emperor of Qin (circa 221 B.C.) was buried under a large pyramid outside modern day Xi'an. In the following centuries about a dozen more Han Dynasty royals were also buried under flat-topped pyramidal earth works.
Unknown "elçinnnnnn" Peppy - 16 years, 8 months, 2 days ago

Egyptian pyramids

The most famous pyramids are the Egyptian pyramids — huge structures built of brick or stone, some of which are among the largest man-made constructions. Most of them took about 27 years to build. In Ancient Egypt, a pyramid was referred to as mer, literally "place of ascendance." The Great Pyramid of Giza is the largest in Egypt and one of the largest in the world. Until Lincoln Cathedral was built in 1300 A.D., it was the tallest building in the world. The base is over 52,600 square meters in area.
Unknown "elçinnnnnn" Peppy - 16 years, 8 months, 2 days ago

It is one of the Seven Wonders of the World, and the only one of the seven to survive into modern times. The Ancient Egyptians capped the peaks of their pyramids with gold and covered their faces with polished white limestone, though many of the stones used for the purpose have fallen or been removed for other structures.
Unknown "elçinnnnnn" Peppy - 16 years, 8 months, 2 days ago