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° · Glossary · °

Platonic Solids .- polyhedra whose faces are all congruent regular polygons is called "polyhedra regular" or "Platonic solids."

Solido .- A three-dimensional object: width, height and depth.
Examples include spheres, cubes, pyramids and cylinders .

Arista .- straight line of intersection of two planes or two surfaces of a polyhedron that intersect: the edge of a polyhedron is the straight line The two sides are cut.

Face .- In geometry, a face is becoming one of the planes forming an angle or polyhedron dihedral , or each of the polygons included or limit a polyhedron .

Vertex (in plane geometry) .-

point at which they are the two rays of an angle or point of intersection of two sides of a figure flat.

Vertex (in geometry) .-

shared Point three or more sides of a solid figure .

Poligono .- A plane shape (two dimensional) with straight sides.

Examples: triangles, rectangles and pentagons.

(Note: A circle is not a polygon because it has a curved side).

Pentagon .- The pentagon is a polygon five equal sides and five equal angles s

.- Regular polygon is having equal angles and equal sides.

Icosahedron .- is a polyhedron that has twenty equilateral triangular faces congruent.

dihedral angle .- is each of the two parts of space bounded by two half-planes starting from a ridge common.

interior angle or inner angle : is an angle formed by two sides a polygon that share a tip common and that is contained within the polygon. A simple polygon has exactly one internal angle for each vertex and is located on the side of the polygon as .

A Dodecahedron .- is a solid which has twelve pentagonal faces identical regular. It is one of the five regular polyhedra.

congruent triangles - Two triangles are congruent only if there is a correspondence such their corresponding parts are congruent.

equilateral triangle .- equilateral triangle three sides and angles equal.

convex polyhedron: is one in which the segment joining any two points is contained in the polyhedron .

Parallelogram: is a special type of quadrilateral (a polygon composed of four sides) whose sides are parallel in pairs .

Cube or hexahedron regular : is a polyhedron of six square faces consistent, being a so-called Platonic solids.

Quadrilateral: is a polygon has four sides. Quadrilaterals can take different forms but they all have four vertices and two diagonal . Other names used to refer to this polygon are tetragon and Quad.

Square .- The square is the geometric figure formed by four straight lines of equal length, called sides, perfectly straight angles at the points of connection between them (corners at 90 degrees).

Polyhedron .- A solid with flat sides ( Greek poly, meaning "many" and "edron that means" faces "). Example: pyramids and prisms.

regular Polyhedra

have all dihedral angles and all angles equal polyhedra and their faces are equal regular polygons.

Tetaedro: A tetrahedron is a polyhedron with four faces. With this number of heads is bound to be a convex polyhedron, and triangular faces, three of them were found at each corner, is a regular triangular pyramid

Tetrahedron

• 4 faces (equilateral triangles)
• 4 vertices
• 6 edges

Cube

• 6 faces (squares)
8 vertices 12 edges

Octahedron

• 8 faces (equilateral triangles)
6 vertices 12 edges

Dodecahedron

• 12 faces (pentagons)
• 20 vertices 30 edges

icosahedron

• 20 faces (equilateral triangles)
• 12 vertices 30 edges