pyramids are triangular because of some religious reasons which include stairway to heaven,protection of spirits and all... .According to geometry triangular shapes are more durable and can stand longer,more easy to build...
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The 7-letter word for a 3D shape with triangular faces is "pyramid." A pyramid is a polyhedron with a polygonal base and triangular faces that meet at a common vertex called the apex. Pyramids are classified based on the shape of their base, such as square pyramids, triangular pyramids, pentagonal pyramids, etc.
Some of the pyramids in Antarctica resemble a triangular pyramid.
One difference is square pyramids have 4 triangular faces while rectangular prisms have none!
Triangular pyramids are built that way because water was thought as acid to the mummified Pharaohs, so if it rained the pharaohs were safe.
A triangular pyramid is a three dimensional figure whose base is a triangle in shape. Triangular pyramids also have three side faces that are also triangles, four vertices, and six edges.