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2. Distance from a point to a line - Wikipedia

   en.wikipedia.org/.../Distance_from_a_point_to_a_line

   The distance (or perpendicular distance) from a point to a line is the shortest distance from a fixed point to any point on a fixed infinite line in Euclidean geometry. It is the length of the line segment which joins the point to the line and is perpendicular to the line. The formula for calculating it can be derived and expressed in several ways.

3. Multiplication sign - Wikipedia

   en.wikipedia.org/wiki/Multiplication_sign

   U+00F7 ÷ DIVISION SIGN. The multiplication sign ( × ), also known as the times sign or the dimension sign, is a mathematical symbol used to denote the operation of multiplication, which results in a product. [ 1] While similar to a lowercase X ( x ), the form is properly a four-fold rotationally symmetric saltire. [ 2]

4. Connect the dots - Wikipedia

   en.wikipedia.org/wiki/Connect_the_dots

   Connect the dots. A partially solved puzzle. Connect the dots (also known as connect-the-dots, dot to dot, join the dots or follow the dots) is a form of puzzle containing a sequence of numbered dots. [ 1] When a line is drawn connecting the dots the outline of an object is revealed. The puzzles frequently contain simple line art to enhance the ...

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6. Order of operations - Wikipedia

   en.wikipedia.org/wiki/Order_of_operations

   In Germany, the convention is simply taught as Punktrechnung vor Strichrechnung, dot operations prior line operations referring to the graphical shapes of the taught operator signs U+00B7 · MIDDLE DOT (multiplication), U+2236 ∶ RATIO (division), and U+002B + PLUS SIGN (addition), U+2212 − MINUS SIGN (subtraction).

7. Table of mathematical symbols by introduction date - Wikipedia

   en.wikipedia.org/wiki/Table_of_mathematical...

   middle dot(for multiplication) 1698 (perhaps deriving from a much earlier use of middle dot to separate juxtaposed numbers) division slash(a.k.a. solidus) 1718 (deriving from horizontal fraction bar, invented by Abu Bakr al-Hassarin the 12th century) Thomas Twining.