A polygon made up of three sides is known as triangle.

A cuboid has $$6$$ flat square faces.

cube has $$12$$ edges.

A cube has $$6$$ faces. An example of cube is a a dice where every face is numbered from one to six. 

square has 4 sides and four corners

A cylinder has two curved edges, where the cylinderical part meets the circular base and the top.

All the edges of a cube are of equal length. All faces are square in shape. 

A cylinder is a space figure with two circular, parallel and congruent bases.

A cuboid is a $$3-D$$ solid object bounded by $$6$$ rectangular faces, with three faces meeting at each vertex.

A polyhedron is a three dimensional figure made up of sides called faces, each face being a polygon.
Cube is a polyhedron.

A cylinder doesn't have any vertex.

Regular Polyhedrons are the solids with identical regular polygons as their faces.
Example: Octahedron is a regular polyhedron as the faces of this octahedron are congruent and are regular polygons.

Polygons that are made up of regular polygons are called regular polyhedron.
Example: A cube is a platonic solid because all six of its faces are congruent squares.

Polygons that are made up of convex polygons are called convex polyhedron.
Example: Cube

Solid figures having only line segments as their edges are called polyhedrons.

We need to count the number of the faces outside, they will be the ones colored red.

A polyhedron is regular if its faces are congruent regular polygons and the same number of faces meet at each vertex.
Example: Octahedron is a regular polyhedron as the faces of this octahedron are congruent and are regular polygons.

A cuboid has $$ 8 $$ vertices , which is maximum among the given solids.

$${\textbf{Step -1: Defining a cube}.}$$

                $${\text{In geometry, a cube is a three - dimensional solid object bounded by six square faces}.}$$

                  

                $${\text{All the faces in cube are square i}}{\text{.e}}{\text{., all the sides of cube are of same length}}{\text{.}}$$

$${\textbf{Step -2: Defining a square prism}.}$$

                $${\text{A square prism is a three - dimensional cuboid where the base and top are equal squares and }}$$

                $${\text{the remaining 4 faces may be any Quadrilateral }.}$$

                  

                $${\text{In square prism, the base and its opposite face are squares}.}$$

$${\textbf{Step -3: Comparing square prism and cube}.}$$

               $${\text{A cube is a special type of square prism where the lengths in all three dimensions are the same}.}$$

               $${\text{All cube are square prism, but all square prism is not cube}.}$$

$${\textbf{Hence, For cube and square prism to be same, the height of square prism must }}$$

 $${\textbf{be equal to length of its base. Thus, option C is correct}.}$$

The right prisms are named based on their bases.

The given 3-D object has all six faces as rectangles.

A pyramid is a polyhedron formed by connecting a polygonal base and a point, called the apex. Each base edge and apex form a triangle, called a lateral face. 

A solid with polygonal base and vertex is a Pyramid.

A right pyramid is a pyramid with a base that is a regular polygon and whose apex is directly above the centre of the base.

The pentagonal prism is a prism with a pentagonal base.