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  2. Sector (instrument) - Wikipedia

    en.wikipedia.org/wiki/Sector_(instrument)

    A typical English sector, probably from the early 19th century, made of ivory with a brass hinge. This side has scales for lines of lines (L), secants (S), chords (C), and polygons (POL), along with a scale of 10ths of inches on the outer edges forming a straight 12-inch rule when the sector is fully opened, and a scale of 100ths of a foot marked along the side (only barely visible in this ...

  3. Octadecagon - Wikipedia

    en.wikipedia.org/wiki/Octadecagon

    Coxeter states that every zonogon (a 2m-gon whose opposite sides are parallel and of equal length) can be dissected into m(m-1)/2 parallelograms. [6] In particular this is true for regular polygons with evenly many sides, in which case the parallelograms are all rhombi. For the regular octadecagon, m=9, and it can be divided into 36: 4 sets of ...

  4. Decagon - Wikipedia

    en.wikipedia.org/wiki/Decagon

    A regular decagon has all sides of equal length and each internal angle will always be equal to 144°. [1] Its Schläfli symbol is {10} [ 2 ] and can also be constructed as a truncated pentagon , t{5}, a quasiregular decagon alternating two types of edges.

  5. Internal and external angles - Wikipedia

    en.wikipedia.org/wiki/Internal_and_external_angles

    The sum of all the internal angles of a simple polygon is π(n − 2) radians or 180(n – 2) degrees, where n is the number of sides. The formula can be proved by using mathematical induction : starting with a triangle, for which the angle sum is 180°, then replacing one side with two sides connected at another vertex, and so on.

  6. Heptagon - Wikipedia

    en.wikipedia.org/wiki/Heptagon

    In geometry, a heptagon or septagon is a seven-sided polygon or 7-gon.. The heptagon is sometimes referred to as the septagon, using "sept-" (an elision of septua-, a Latin-derived numerical prefix, rather than hepta-, a Greek-derived numerical prefix; both are cognate) together with the Greek suffix "-agon" meaning angle.

  7. Election results: Measure 118, the so-called Oregon rebate - AOL

    www.aol.com/election-results-measure-118-called...

    This measure would raise the minimum tax on businesses with sales in the state in excess of $25 million by 3% and 'rebate' the proceeds to Oregonians. Election results: Measure 118, the so-called ...

  8. Regular polygon - Wikipedia

    en.wikipedia.org/wiki/Regular_polygon

    For a regular polygon with 10,000 sides (a myriagon) the internal angle is 179.964°. As the number of sides increases, the internal angle can come very close to 180°, and the shape of the polygon approaches that of a circle. However the polygon can never become a circle.

  9. Measure 118: 'Oregon Rebate' proposes taxing ... - AOL

    www.aol.com/news/measure-118-oregon-rebate...

    Millions have been raised in opposition of the measure which would raise taxes on some corporations and distribute the money to every Oregonian. Measure 118: 'Oregon Rebate' proposes taxing ...