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2. Ford circle - Wikipedia

   en.wikipedia.org/wiki/Ford_circle

   In mathematics, a Ford circle is a circle in the Euclidean plane, in a family of circles that are all tangent to the -axis at rational points. For each rational number p / q {\displaystyle p/q} , expressed in lowest terms, there is a Ford circle whose center is at the point ( p / q , 1 / ( 2 q 2 ) ) {\displaystyle (p/q,1/(2q^{2}))} and whose ...

3. Roundabout - Wikipedia

   en.wikipedia.org/wiki/Roundabout

   The Hotel Indonesia Roundabout in Jakarta, Indonesia A roundabout in Kent, UK on the A13 highway near Sadlers Farm. A roundabout, a rotary and a traffic circle are types of circular intersection or junction in which road traffic is permitted to flow in one direction around a central island, and priority is typically given to traffic already in the junction.

4. Johnson circles - Wikipedia

   en.wikipedia.org/wiki/Johnson_circles

   In geometry, a set of Johnson circles comprises three circles of equal radius r sharing one common point of intersection H.In such a configuration the circles usually have a total of four intersections (points where at least two of them meet): the common point H that they all share, and for each of the three pairs of circles one more intersection point (referred here as their 2-wise intersection).

5. Number Sense (UIL) - Wikipedia

   en.wikipedia.org/wiki/Number_Sense_(UIL)

   For district meet academic championship and district meet sweepstakes awards, points are awarded to the school as follows: Individual places: 1st—15, 2nd—12, 3rd—10, 4th—8, 5th—6, and 6th—4. Team places: 1st—9 and 2nd—4. The maximum number of points a school can earn in Number Sense is 37.

6. Traffic - Wikipedia

   en.wikipedia.org/wiki/Traffic

   Traffic laws govern and regulate traffic, while rules of the road include traffic laws and informal rules that may have developed over time to facilitate the orderly and timely flow of traffic. [1] Organized traffic generally has well-established priorities, lanes, right-of-way, and traffic control at intersections .

7. Problem of Apollonius - Wikipedia

   en.wikipedia.org/wiki/Problem_of_Apollonius

   Let a pair of solution circles be denoted as C A and C B (the pink circles in Figure 6), and let their tangent points with the three given circles be denoted as A 1, A 2, A 3, and B 1, B 2, B 3, respectively. Gergonne's solution aims to locate these six points, and thus solve for the two solution circles.