Question

what is the definition of a pyramid? a pyramid is a polyhedron that has one special face called the base, and all the other faces are triangles that meet at a single vertex. a pyramid is a polygon with 4 straight sides and four vertices. a pyramid is a polyhedron with two parallel faces that are identical copies of each other, called bases, connected by rectangles. a pyramid is a polygon with three straight sides and three vertices.

Explanation:

A pyramid is a 3D polyhedron. The first option correctly defines it as having one base face and other triangular faces meeting at a single vertex. The second describes a quadrilateral (2D), the third a prism, the fourth a triangle (2D).

Answer:

A pyramid is a polyhedron that has one special face called the base, and all the other faces are triangles that meet at a single vertex.