congruent
61Congruence (geometry) — An example of congruence. The two figures on the left are congruent, while the third is similar to them. The last figure is neither similar nor congruent to any of the others. Note that congruence …
62Context-dependent memory — refers to improved recall of specific episodes or information when the context present at encoding and retrieval are the same. One particularly common example of context dependence at work occurs when an individual has lost an item (e.g. lost car …
63Peaucellier-Lipkin linkage — The Peaucellier Lipkin linkage (or Peaucellier Lipkin cell), invented in 1864, was the first linkage capable of transforming rotary motion into perfect straight line motion, and vice versa. It is named after Charles Nicolas Peaucellier (1832… …
64Isosceles trapezoid — An isosceles trapezoid ( isosceles trapezium in British English) is a quadrilateral with a line of symmetry bisecting one pair of opposite sides, making it automatically a trapezoid. Two opposite sides are parallel, the two other sides are of… …
65Euclidean geometry — A Greek mathematician performing a geometric construction with a compass, from The School of Athens by Raphael. Euclidean geometry is a mathematical system attributed to the Alexandrian Greek mathematician Euclid, which he described in his… …
66Spit (card game) — Infobox Game subject name = Spit players = 2 setup time = 10–60 seconds playing time = 5 minutes 15 minutes* complexity = Easy strategy = Low random chance = High skills = Speed, quick thinking footnotes = * Game length varies to layout and skill …
67Hilbert's axioms — are a set of 20 assumptions (originally 21), David Hilbert proposed in 1899 as the foundation for a modern treatment of Euclidean geometry. Other well known modern axiomatizations of Euclidean geometry are those of Tarski and of George… …
68Tarski's axioms — Tarski s axioms, due to Alfred Tarski, are an axiom set for the substantial fragment of Euclidean geometry, called elementary, that is formulable in first order logic with identity, and requiring no set theory. Other modern axiomizations of… …
69Banach–Tarski paradox — The Banach–Tarski paradox is a theorem in set theoretic geometry which states that a solid ball in 3 dimensional space can be split into several non overlapping pieces, which can then be put back together in a different way to yield two identical …
70Perpendicular — In geometry, two lines or planes (or a line and a plane), are considered perpendicular (or orthogonal) to each other if they form congruent adjacent angles. The term may be used as a noun or adjective. Thus, referring to Figure 1, the line AB is… …
