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  2. Cartographic design - Wikipedia

    en.wikipedia.org/wiki/Cartographic_design

    Planning: The iterative ... many of which are loosely based on 45 degree angles as originally ... functional label placement tends to follow a number of rules that ...

  3. Special right triangle - Wikipedia

    en.wikipedia.org/wiki/Special_right_triangle

    Set square shaped as 45° - 45° - 90° triangle The side lengths of a 45° - 45° - 90° triangle 45° - 45° - 90° right triangle of hypotenuse length 1.. In plane geometry, dividing a square along its diagonal results in two isosceles right triangles, each with one right angle (90°, ⁠ π / 2 ⁠ radians) and two other congruent angles each measuring half of a right angle (45°, or ...

  4. Buys Ballot's law - Wikipedia

    en.wikipedia.org/wiki/Buys_Ballot's_law

    These are very general rules that are subject to many other factors, including shapes of the coastline, and topography in any location. Although the principles apply to a very limited extent to a coastal observer during the approach and passage of a storm in any location, Buys Ballot's law was primarily formulated from empirical data to assist ...

  5. Set square - Wikipedia

    en.wikipedia.org/wiki/Set_square

    Similar to the Geodreieck, a number of other protractor triangle types exist for navigation purposes. Various designs are named navigation (protractor) triangle, nautical navigational triangle, nautical set square, Portland (navigational) triangle or Portland protractor triangle, Kent-type triangle, Inoue-type A/B nautical triangle or plotting triangle, course triangle, yachtsmen triangle, and ...

  6. Strike and dip - Wikipedia

    en.wikipedia.org/wiki/Strike_and_dip

    Strike and dip are generally written as 'strike/dip' or 'dip direction,dip', with the degree symbol typically omitted. The general alphabetical dip direction (N, SE, etc) can be added to reduce ambiguity. For a feature with a dip of 45° and a dip direction of 75°, the strike and dip can be written as 345/45 NE, 165/45 NE, or 075,45.

  7. Is Fidelity's 45% Rule the Right Retirement Strategy for You?

    www.aol.com/fidelitys-45-rule-really-guide...

    Among retirement rules of thumb, saving 10 times your salary by 67 reigns supreme. But workers should also have another way by planning for their savings to provide 45% of their pretax ...

  8. 45th parallel north - Wikipedia

    en.wikipedia.org/wiki/45th_parallel_north

    The 45th parallel north is often called the halfway point between the equator and the North Pole, but the true halfway point is 16.0 km (9.9 mi) north of it (approximately between 45°08'36" and 45°08'37") because Earth is an oblate spheroid; that is, it bulges at the equator and is flattened at the poles. [1]

  9. Naismith's rule - Wikipedia

    en.wikipedia.org/wiki/Naismith's_rule

    The basic rule assumes hikers of reasonable fitness, on typical terrain, and under normal conditions. It does not account for delays, such as extended breaks for rest or sightseeing, or for navigational obstacles. For planning expeditions a team leader may use Naismith's rule in putting together a route card. [citation needed]