Unformatted text preview: 12. volumes and areas. 13. the golden ratio with polygons and 3 dimensional shapes whose faces are congruent. 3. What is a regular solid? What are the 5 regular solids? a regular solid is a "three dimensional figure having planar faces, with each face a regular polygon, all faces congruent and all angles between pairs of adjacent faces the same."(Devlin 148) The five regular solids are the: Cube, Tetrahedron, Octahedron, Dodecahedron, and Icosahedron. 4. Why is the standard xyplane called the Cartesian coordinate system? Why was this such a crucial innovation? It was invented by Descartes whose name in Latin was Cartesius and therefore the grid was named Cartesian after Descartes. the system was most important because it enabled mathematicians to use algebra techniques to play with geometry...
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 Spring '08
 Depends
 Geometry, Cartesian Coordinate System, Euclid's Elements, Platonic solid, Golden ratio

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