A solid figure has a base that is a polygon and triangular faces that meet at a vertex is a pyramid then the correct option is A.
What is a pyramid?
In terms of geometry, a pyramid is a polyhedron that is created by joining an and a polygonal base. A triangle known as a lateral face is formed by each base edge. It has a polygonal basis and is a conic solid.
A square pyramid is considered to be canonical and makes up half of a regular octahedron if all of its edges are tangent to a sphere and the average positions of its tangential points are near the center of the sphere.
Pyramids with bases that are hexagonal or larger must be made of isosceles triangles. A heptagonal or higher pyramid would have the triangles not meet at all, whereas a hexagonal pyramid with equilateral triangles would be a fully flat figure.
Hence, the correct option is A.
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