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  2. New tourist attraction in Amador County’s Gold Country is a ...

    www.aol.com/news/tourist-attraction-amador...

    The rail bikes are uncovered, which makes hats, sunscreen and plenty of water needed on warm days. Those interested can visit RailExplorers.net or call 877-833-8588 for tickets.

  3. Saccheri quadrilateral - Wikipedia

    en.wikipedia.org/wiki/Saccheri_Quadrilateral

    Saccheri quadrilaterals. A Saccheri quadrilateral is a quadrilateral with two equal sides perpendicular to the base.It is named after Giovanni Gerolamo Saccheri, who used it extensively in his 1733 book Euclides ab omni naevo vindicatus (Euclid freed of every flaw), an attempt to prove the parallel postulate using the method reductio ad absurdum.

  4. All-terrain vehicle - Wikipedia

    en.wikipedia.org/wiki/All-terrain_vehicle

    An all-terrain vehicle (ATV), also known as a light utility vehicle (LUV), [1] a quad bike or quad (if it has four wheels), as defined by the American National Standards Institute (ANSI), is a vehicle that travels on low-pressure tires, has a seat that is straddled by the operator, and has handlebars, similar to a motorcycle. As the name ...

  5. Quadracycle - Wikipedia

    en.wikipedia.org/wiki/Quadracycle

    A tourist rental quadricycle: Quadricycle International Q-Cycle-6 [1] A Rhoades Car 4W2P 4-Wheel Bike parked on a Canadian urban street. A quadracycle (also spelled quadricycle) is a four-wheeled human-powered land vehicle. It is also referred to as a quadcycle, pedal car or four-wheeled bicycle amongst other terms.

  6. Khayyam-Saccheri quadrilateral - Wikipedia

    en.wikipedia.org/?title=Khayyam-Saccheri...

    move to sidebar hide. From Wikipedia, the free encyclopedia

  7. Giovanni Girolamo Saccheri - Wikipedia

    en.wikipedia.org/wiki/Giovanni_Girolamo_Saccheri

    Ceva convinced Saccheri to devote himself to mathematical research and became the young man's mentor. Saccheri was in close scientific communion with both brothers. He used Ceva's ingenious methods in his first published work, 1693, solutions of six geometric problems proposed by the Sicilian mathematician Ruggero Ventimiglia (1670-1698). [6]

  8. List of rail trails - Wikipedia

    en.wikipedia.org/wiki/List_of_rail_trails

    Gippsland Plains Rail Trail: Victoria: 63 km (39 mi) 190 km (120 mi) east of Melbourne [33] Ballarat-Skipton Rail Trail: Victoria: 57 km (35 mi) 110 km (68 mi) northwest of Melbourne [34] Mt Garnet to Lappa Junction Rail Trail: Queensland: 55 km (34 mi) 190 km (120 mi) southwest of Cairns [35] Denmark to Nornalup Rail Trail: Western Australia

  9. Quadricycle - Wikipedia

    en.wikipedia.org/wiki/Quadricycle

    Quadricycle, with an i, was a popular term for human or motorized four wheel bike-like vehicles around the turn of the 19th to 20th century. The Quadricycle was an early form of automobile. Earliest models were propelled by a small steam engine, then designers switched to early internal combustion engines as they became available.