Pronunciation: [dɪkɐhˈiːdɹə] (IPA) 
The word "Decahedra" is spelled with the prefix "deca-" which means "ten". The main part of the word is "hedra" which refers to a three-dimensional shape or solid figure. Therefore, "Decahedra" means "ten-sided solid figures". The IPA phonetic transcription for the word is /dɛkəˈhiːdrə/. The stress is on the second syllable "hedra". The "e" in "deca-" is pronounced like "eh" and the "a" in "hedra" is pronounced like "a" in "cat".
Decahedra refers to the plural form of the word "decahedron," which is a polyhedron composed of ten flat faces. The term originates from the Ancient Greek words "deka" (meaning ten) and "hedra" (meaning face).
A decahedron is a three-dimensional geometric figure consisting of ten faces, each of which is a polygon. In a decahedron, all faces are congruent and regular polygons, meaning that they have equal side lengths and angles. However, the shape of the polygons may vary, resulting in different types of decahedra.
Common examples of decahedra include the regular dodecahedron, which is made up of 12 regular pentagonal faces, and the regular triangular gyrobicupola, formed by 12 equilateral triangle faces and 18 equilateral triangle edges.
Decahedra possess several notable properties. Firstly, as mentioned, their faces are congruent and regular, making them highly symmetrical. Additionally, the vertices of a decahedron connect to three different faces, creating a strong linkage between the faces, edges, and vertices.
Decahedra can be found in various fields such as architecture, art, mathematics, and crystallography. Given their symmetrical and aesthetic qualities, decahedra often appear as attractive design elements in structural and ornamental objects. In mathematics, decahedra are studied as a specific type of polyhedron, and their properties are explored to understand various geometrical concepts and construct geometric models.
The word "Decahedra" is derived from ancient Greek. It combines two Greek words: "deka", meaning "ten", and "hedra", meaning "face" or "base". "Decahedra" thus refers to a polyhedron that has ten faces.
