Roulette (curve) application of this is that a square wheel could roll without bouncing on a road that is a matched series of catenary arcs. Roulette (curve) In the differential geometry of curves, a roulette is a kind of curve, generalizing cycloids, epicycloids, hypocycloids, trochoids, and involutes. Roughly speaking, a roulette is the curve described by a point (called the "generator" or "pole") attached to a given curve as that curve rolls without slipping, along a second given curve that is fixed. More precisely, given a curve attached to a plane which is moving so that the curve rolls, without slipping, along
Diary of a Wimpy Kid: The Third Wheel Diary of a Wimpy Kid: The Third Wheel Diary of a Wimpy Kid: The Third Wheel is a 2012 bestselling children's novel and the seventh book in the Diary of a Wimpy Kid series, written by American author Jeff Kinney. Kinney announced the book in March 2012, with "The Third Wheel"s cover revealed in May 2012. The book was released on November 13, 2012. Greg recalls several anecdotes from the time of his conception to his preschool years, notable ones include how his mother read to him before bed, how his parents’ excessive kissing supposedly led to his premature birth,