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Constructions

Constructions. History. Geometric constructions: what can be built with just a straight-edge and a compass Ancient Greeks asked many questions about constructions: Can we trisect an arbitrary angle? Is it possible to double the cube? Can we square the circle?. Rules for Constructions.

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Constructions

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  1. Constructions

  2. History • Geometric constructions: what can be built with just a straight-edge and a compass • Ancient Greeks asked many questions about constructions: • Can we trisect an arbitrary angle? • Is it possible to double the cube? • Can we square the circle?

  3. Rules for Constructions 0. Start with 2 distinct points in the plane • Can draw a line through any 2 already constructed points. • Can draw a circle with center an already constructed point and through another already constructed point. • Can construct points which are at intersection of 2 distinct constructed lines, 2 distinct constructed circles, or a constructed line and a constructed circle

  4. Definitions • A figure is constructible if we can construct it by applying rules 0 and a finite number of steps 1-3. • The sequence of steps is called a construction. • The 2 points in step 0 are called the base points.

  5. Examples • Equilateral triangle • Square • Bisect angle • Pentagon • 15-gon • mn-gon when m and n are relatively prime

  6. Tilings • Regular tiling of the plane consists of regular polygons

  7. Platonic Solids

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