# Which Is A Regular Polyhedron?

A regular polygon is a (convex) planar figure with all edges equal and all corners equal. A regular polyhedron is a solid (convex) figure with all faces being congruent regular polygons, the same number arranged all alike around each vertex.

### What do you mean by regular solids?

Definition of regular solid

: any of the five possible regular polyhedrons that include the regular forms of the tetrahedron, hexahedron, octahedron, dodecahedron, and icosahedron.

### What is polyhedron in math class 8?

A polyhedron is a solid shape that is bounded by polygons which are called its faces, these faces meet ar edges which are line segments and the three edges meet at vertices which are points. Spheres, Cones, and Cylinders are a few examples of non-polyhedrons.

### Is pyramid a polyhedron?

In geometry, a pyramid (from Greek: πυραμίς pyramís) 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. It is a conic solid with polygonal base.

### Why are there exactly five regular polyhedra?

In a nutshell: it is impossible to have more than 5 platonic solids, because any other possibility violates simple rules about the number of edges, corners and faces we can have together.

### What is regular polyhedron Class 8?

A polyhedron is a regular polyhedron if its faces are formed by the regular polygons and the same number of meet at each vertex.

### What's the meaning of polyhedra?

Definition of polyhedron

: a solid formed by plane faces.

### Is cuboid a regular polyhedron?

A cube is a regular polyhedron but cuboid is not a regular polyhedron.

### What is prism and pyramid?

Both prism and pyramid are three dimensional solids that have flat-faces and base. But a Prism has two identical bases whereas a pyramid has only one base.

### Which is a regular polyhedron?

A regular polygon is a (convex) planar figure with all edges equal and all corners equal. A regular polyhedron is a solid (convex) figure with all faces being congruent regular polygons, the same number arranged all alike around each vertex.

### What is a polygon with 12 sides called?

A dodecagon is a 12-sided polygon. Several special types of dodecagons are illustrated above. In particular, a dodecagon with vertices equally spaced around a circle and with all sides the same length is a regular polygon known as a regular dodecagon.

### Which of the following has 5 lines of symmetry?

A regular pentagon has 5 sides and 5 lines of symmetry. The number of lines of symmetry in a regular polygon is equal to the number of sides.

Dated : 13-Jun-2022

Category : Education