Roulette (curve) in this case, the point lies on the circle then the roulette is a cycloid. A related concept is a glissette, the curve described by a point attached to a given curve as it slides along two (or more) given curves. Formally speaking, the curves must be differentiable curves in the Euclidean plane. The "fixed curve" is kept invariant; the "rolling curve" is subjected to a continuous congruence transformation such that at all times the curves are tangent at a point of contact that moves with the same speed when taken along either curve (another way to express this constraint
Diary of a Wimpy Kid: The Third Wheel book ends with Uncle Gary winning $40,000 and paying Dad with the money, and moves out of the house. Rowley and Abigail are dating, and Greg gets the chicken pox. Greg is finally able to take baths and be by himself in the bathroom, but he now starts to think if he is really alone, when a fresh towel near the tub disappears. Critical and reader reception for "The Third Wheel" was positive, with the "San Angelo Standard-Times" calling the book "masterful." Diary of a Wimpy Kid: The Third Wheel Diary of a Wimpy Kid: The Third Wheel is a