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2. Grade (slope) - Wikipedia

   en.wikipedia.org/wiki/Grade_(slope)

   This means that for every 4 units (feet or metres) of horizontal distance there is a 1 unit (foot or metre) vertical change either up or down." [3] Any of these may be used. Grade is usually expressed as a percentage - converted to the angle α by taking the inverse tangent of the standard mathematical slope, which is rise / run or the grade ...

3. Roof pitch - Wikipedia

   en.wikipedia.org/wiki/Roof_pitch

   Definitions vary on when a roof is considered pitched. In degrees, 10° (2 in 12 or 1 in 6) is considered by at least one reference a minimum. [5] In trigonometric expression, exact roof slope in degrees is given by the arctangent. For example: arctan(3 ⁄ 12) = 14.0°. Framing carpenters cut rafters on an angle to "pitch" a roof.

4. Interstate Highway standards - Wikipedia

   en.wikipedia.org/wiki/Interstate_Highway_standards

   Longer bridges can reduce the width of both shoulders to 4 feet (1.2 m). Existing bridges can remain part of the Interstate system if they have at least 12-foot-wide (3.7 m) lanes with 3.5-foot (1.1 m) shoulder on the left and a 10-foot (3.0 m) shoulder on the right, except that longer bridges can have 3.5 feet (1.1 m) shoulders on both sides.

5. Dropped ceiling - Wikipedia

   en.wikipedia.org/wiki/Dropped_ceiling

   A dropped ceiling is a secondary ceiling, hung below the main (structural) ceiling. It may also be referred to as a drop ceiling, T-bar ceiling, false ceiling, suspended ceiling, grid ceiling, drop in ceiling, drop out ceiling, or ceiling tiles and is a staple of modern construction and architecture in both residential and commercial applications.

6. Slope - Wikipedia

   en.wikipedia.org/wiki/Slope

   Slope illustrated for y = (3/2)x − 1.Click on to enlarge Slope of a line in coordinates system, from f(x) = −12x + 2 to f(x) = 12x + 2. The slope of a line in the plane containing the x and y axes is generally represented by the letter m, [5] and is defined as the change in the y coordinate divided by the corresponding change in the x coordinate, between two distinct points on the line.

7. Airspace class (United States) - Wikipedia

   en.wikipedia.org/wiki/Airspace_class_(United_States)

   Each distinct segment of class B airspace contains figures indicating the upper and lower altitude limits of that segment in units of one hundred feet, shown as a fraction, e.g., 100 over 40 indicates a ceiling of 10,000 feet (3,000 m) MSL and a floor of 4,000 feet (1,200 m) MSL (SFC indicates that the segment begins at the surface).

8. Cricket (roofing) - Wikipedia

   en.wikipedia.org/wiki/Cricket_(roofing)

   In some cases, a cricket can be used to transition from one roof area to another. On low-slope and flat roofs with parapet walls, crickets are commonly used to divert water to the drainage, against or perpendicular to the main roof slope. The pitch of a cricket is sometimes the same as the rest of the roof, but not always. For Steep-slope roofs ...

9. Slope stability analysis - Wikipedia

   en.wikipedia.org/wiki/Slope_stability_analysis

   Conventional methods of slope stability analysis can be divided into three groups: kinematic analysis, limit equilibrium analysis, and rock fall simulators. [10] Most slope stability analysis computer programs are based on the limit equilibrium concept for a two-or three-dimensional model.