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  2. Naismith's rule - Wikipedia

    en.wikipedia.org/wiki/Naismith's_rule

    Pace [6] in minutes per kilometre or mile vs. slope angle resulting from Naismith's rule [7] for basal speeds of 5 and 4 km / h. [n 1] The original Naismith's rule from 1892 says that one should allow one hour per three miles on the map and an additional hour per 2000 feet of ascent. [1] [4] It is included in the last sentence of his report ...

  3. Distance from a point to a line - Wikipedia

    en.wikipedia.org/wiki/Distance_from_a_point_to_a...

    The line with equation ax + by + c = 0 has slope -a/b, so any line perpendicular to it will have slope b/a (the negative reciprocal). Let (m, n) be the point of intersection of the line ax + by + c = 0 and the line perpendicular to it which passes through the point (x 0, y 0). The line through these two points is perpendicular to the original ...

  4. Cardinal direction - Wikipedia

    en.wikipedia.org/wiki/Cardinal_direction

    Cardinal directions or cardinal points may sometimes be extended to include vertical position (elevation, altitude, depth): north and south, east and west, up and down; or mathematically the six directions of the x-, y-, and z-axes in three-dimensional Cartesian coordinates. Topographic maps include elevation, typically via contour lines.

  5. Roman roads - Wikipedia

    en.wikipedia.org/wiki/Roman_roads

    The Appian Way, one of the oldest and most important Roman roads The Roman Empire in the time of Hadrian (r. 117–138), showing the network of main Roman roads. Roman roads (Latin: viae Romanae [ˈwiae̯ roːˈmaːnae̯]; singular: via Romana [ˈwia roːˈmaːna]; meaning "Roman way") were physical infrastructure vital to the maintenance and development of the Roman state, built from about ...

  6. Slope field - Wikipedia

    en.wikipedia.org/wiki/Slope_field

    the slope field is an array of slope marks in the phase space (in any number of dimensions depending on the number of relevant variables; for example, two in the case of a first-order linear ODE, as seen to the right). Each slope mark is centered at a point and is parallel to the vector. The number, position, and length of the slope marks can ...

  7. MapQuest - AOL Help

    help.aol.com/products/mapquest

    Mail. Call live aol support at. 1-800-358-4860. Get live expert help with your AOL needs—from email and passwords, technical questions, mobile email and more.

  8. Frank Slide - Wikipedia

    en.wikipedia.org/wiki/Frank_Slide

    Frank Slide Interpretive Centre. The Frank Slide was a massive rockslide that buried part of the mining town of Frank in the District of Alberta of the North-West Territories, [nb 1] Canada, at 4:10 a.m. on April 29, 1903. Around 44 million cubic metres/110 million tonnes (120 million short tons) of limestone rock slid down Turtle Mountain. [1]

  9. Brachistochrone curve - Wikipedia

    en.wikipedia.org/wiki/Brachistochrone_curve

    The curve of fastest descent is not a straight or polygonal line (blue) but a cycloid (red).. In physics and mathematics, a brachistochrone curve (from Ancient Greek βράχιστος χρόνος (brákhistos khrónos) 'shortest time'), [1] or curve of fastest descent, is the one lying on the plane between a point A and a lower point B, where B is not directly below A, on which a bead slides ...

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