the base of a triangular pyramid is triangle
a square * * * * * That would be a square pyramid! A triangular pyramid would have ... wait for it ... a TRIANGULAR base! Worth waiting for, wasn't it?
It is a pyramid
That would be a triangular pyramid.
If the base of the pyramid is a triangle then all its faces would be triangular in shape.
A tetrahedron or triangular pyramid
Pyramids are classified by the shape of their base. A triangular pyramid has a triangular base and three triangular side faces. A square pyramid has a square base and four triangular sides. A pentagonal pyramid has a pentagonal base and five triangular sides. A hexagonalpyramid has a hexagonal base and six triangular sides, and so on.
All except the base are always triangles; the shape of the base gives the name to the pyramid; eg a pentagonal pyramid has a pentagon as the base and five triangular faces; a triangular pyramid has three triangular faces and also has a triangle for the base.
A pyramid perhaps
A 3-sided pyramid.
A triangular prism is so called because the shape of the ends is a triangle. A triangular pyramid is so called because the shape of the base is a triangle.
An Egyptian Pyramid has 4 triangular sides and 1 SQUAREbase. An Egyptian Pyramid has 4 triangular sides and 1 SQUARE base.
It can be a pyramid shape with an equilateral triangle base
A shape with a square base and four triangular sides is a pyramid.
A pyramid but it can have a base that is different and also a triangle
tetrahedra (a pyramid with a triangular base)
A pentagonal pyramid
A square pyramid.
A pyramid, with a triangular base.
A triangular pyramid is a pyramid that has a triangular shaped base. The tetrahedron is an example of a triangular pyramid.
Pyramid shaped... like triangular but the bottom has a square base and at the top it meets at a point.
A pyramid. Triangular base and three connected sides equal a pyramid.