Expand menu menu_open Minimize Start chapters Home History history History expand_more
{{ item.displayTitle }}
navigate_next
No history yet!
Progress & Statistics equalizer Progress expand_more
Student
navigate_next
Teacher
navigate_next
{{ filterOption.label }}
{{ item.displayTitle }}
{{ item.subject.displayTitle }}
arrow_forward
No results
{{ searchError }}
search
menu_open
{{ courseTrack.displayTitle }}
{{ statistics.percent }}% Sign in to view progress
{{ printedBook.courseTrack.name }} {{ printedBook.name }}
search Use offline Tools apps
Login account_circle menu_open

Pyramid

Concept

Pyramid

A pyramid is a polyhedron in which one face (the base) can be any polygon, and the other faces (the lateral faces) are triangles that meet at a common vertex called the vertex of the pyramid. Similar to the altitude of a triangle, the altitude of a pyramid is the segment from the vertex that is perpendicular to the plane of the base.

The length of the altitude is called the height of the pyramid. A pyramid is regular if its base is a regular polygon and its lateral faces are congruent, isosceles triangles. In a regular pyramid, the length of the altitude of each lateral face is sometimes referred to as the slant height of a pyramid .

If a pyramid is not regular, it is called irregular or oblique.