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  2. Distance between two parallel lines - Wikipedia

    en.wikipedia.org/wiki/Distance_between_two...

    The distance between two parallel lines in the plane is the minimum distance between any two points. Formula and proof. Because the lines are parallel, the ...

  3. Hash mark (sports) - Wikipedia

    en.wikipedia.org/wiki/Hash_mark_(sports)

    In American football and Canadian football, the hash marks are two rows of lines near the middle of the field that are parallel to the side lines.These small lines (4 in [10 cm] wide by 2 ft [61 cm] long) are used to mark the 1-yard sections between each of the 5-yard lines, which go from sideline to sideline.

  4. Public Land Survey System - Wikipedia

    en.wikipedia.org/wiki/Public_Land_Survey_System

    Township (Twp, T): A square parcel of land of 36 square miles, or a measure of the distance north or south from a referenced baseline, in units of six miles. Witness: Any marker set on the ground that marks or represents some other nearby object or location of surveying importance, such as a corner. For example, a bearing tree is a witness to a ...

  5. Parallel (geometry) - Wikipedia

    en.wikipedia.org/wiki/Parallel_(geometry)

    the distance between the two lines can be found by locating two points (one on each line) that lie on a common perpendicular to the parallel lines and calculating the distance between them. Since the lines have slope m, a common perpendicular would have slope −1/m and we can take the line with equation y = −x/m as a common perpendicular ...

  6. Highway location marker - Wikipedia

    en.wikipedia.org/wiki/Highway_location_marker

    Mile marker 23 on US 36 in Delaware County, Ohio. It marks the location which is 23 miles from the Union County line. A highway location marker is the modern-day equivalent of a milestone. Unlike traditional milestones, however, which (as their name suggests) were originally carved from stone and sited at one-mile intervals, modern highway ...

  7. 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]

  8. Baseline (surveying) - Wikipedia

    en.wikipedia.org/wiki/Baseline_(surveying)

    In a triangulation network, at least one distance between two stations needs to be measured to calculate the size of the triangles by trigonometry. In relative Global Navigation Satellite System (GNSS) surveying, a baseline is the line between two GNSS receivers to determine the 3D coordinate difference.

  9. Molecular-weight size marker - Wikipedia

    en.wikipedia.org/wiki/Molecular-weight_size_marker

    The range of a particular marker refers to variety of bands it can map. A "high" range refers to relatively large fragments (measured in kb) while a "low" range refers to markers that distinguish between small fragments (measured in bp). Some markers can even be described as "ultra-low range", [16] but even more precise is the microRNA marker ...