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2. AA postulate - Wikipedia

   en.wikipedia.org/wiki/AA_postulate

   In Euclidean geometry, the AA postulate states that two triangles are similar if they have two corresponding angles congruent.. The AA postulate follows from the fact that the sum of the interior angles of a triangle is always equal to 180°.

3. Congruence (geometry) - Wikipedia

   en.wikipedia.org/wiki/Congruence_(geometry)

   The two triangles on the left are congruent. The third is similar to them. The last triangle is neither congruent nor similar to any of the others. Congruence permits alteration of some properties, such as location and orientation, but leaves others unchanged, like distances and angles.

4. Triple product - Wikipedia

   en.wikipedia.org/wiki/Triple_product

   In geometry and algebra, the triple product is a product of three 3-dimensional vectors, usually Euclidean vectors.The name "triple product" is used for two different products, the scalar-valued scalar triple product and, less often, the vector-valued vector triple product.

5. Collatz conjecture - Wikipedia

   en.wikipedia.org/wiki/Collatz_conjecture

   Directed graph showing the orbits of small numbers under the Collatz map, skipping even numbers. The Collatz conjecture states that all paths eventually lead to 1. The Collatz conjecture [a] is one of the most famous unsolved problems in mathematics.

6. Plus–minus sign - Wikipedia

   en.wikipedia.org/wiki/Plus–minus_sign

   The symbols ± and ∓ are used in chess annotation to denote a moderate but significant advantage for White and Black, respectively. [4] Weaker and stronger advantages are denoted by ⩲ and ⩱ for only a slight advantage, and +– and –+ for a strong, potentially winning advantage, again for White and Black respectively.

7. List of educational video games - Wikipedia

   en.wikipedia.org/wiki/List_of_educational_video...

   This is a list of notable educational video games.. There is some overlap between educational games and interactive CD-ROMs and other programs (based on player agency), and between educational games and related genres like simulations and interactive storybooks (based on how much gameplay is devoted to education).

8. Equation solving - Wikipedia

   en.wikipedia.org/wiki/Equation_solving

   An example of using Newton–Raphson method to solve numerically the equation f(x) = 0. In mathematics, to solve an equation is to find its solutions, which are the values (numbers, functions, sets, etc.) that fulfill the condition stated by the equation, consisting generally of two expressions related by an equals sign.

9. Inequality (mathematics) - Wikipedia

   en.wikipedia.org/wiki/Inequality_(mathematics)

   The feasible regions of linear programming are defined by a set of inequalities.. In mathematics, an inequality is a relation which makes a non-equal comparison between two numbers or other mathematical expressions. [1]