Triangular Pyramid.
Yes
triangular pyramid
A pyramid.
It has less than three sides.
A cylinder is a polygon that has circles as its base. A triangular pyramid is a polygon that has a triangle as its base.
no A polygon is a 2-dimensional object, while a triangular prism is a 3-dimensional object.
Triangular Pyramid.
Yield signs are triangular, but have rounded corners. An actual triangular shape, if equilateral, would be a regular polygon.
triangular polygon
Yes
A triangle forms the cross-section of a triangular prism.
triangular prism
triangular pyramid
A pyramid.
It has less than three sides.
All but one face must be triangular. The base can be any polygon, including a triangle.