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mathworld.wolfram.com/Collinear.html

Collinear. Three or more points , , , ..., are said to be collinear if they lie on a single straight line. A line on which points lie, especially if it is related to a geometric figure such as a triangle, is sometimes called an axis. Two points are trivially collinear since two points determine a line.

en.wikipedia.org/wiki/Collinearity

In geometry, collinearity of a set of points is the property of their lying on a single line. A set of points with this property is said to be collinear (sometimes spelled as colinear).In greater generality, the term has been used for aligned objects, that is, things being "in a line" or "in a row".

www.mathsisfun.com/definitions/collinear.html

When three or more points lie on a straight line. (Two points are always in a line.) These points are all collinear (try moving them):

www.mathopenref.com/collinear.html

Obviously two points are always collinear, since a straight line can always be drawn through two points. Sometimes it is spelled 'colinear' (with one L). Word Usage We say that "point Q is collinear with points P, R and S". Or put another way, "the points P, Q, R and S are collinear".

www.merriam-webster.com/dictionary/collinear

Definition of collinear 1 : lying on or passing through the same straight line 2 : having axes lying end to end in a straight line collinear antenna elements

www.quora.com/What-are-collinear-lines

Lines are not collinear. Points that are collinear are points that lie on the same line. Any two points are collinear, so usually any interesting set of collinear points contains three or more.

www.thefreedictionary.com/collinear

Define collinear. collinear synonyms, collinear pronunciation, collinear translation, English dictionary definition of collinear. adj. 1. Passing through or lying on the same straight line. 2.

www.dictionary.com/browse/collinear

The half-lines r and s are collinear, and together form one complete line. Encyclopaedia Britannica, 11th Edition, Volume 11, Slice 6. Various. The collinear centres are the three sets of one external and two internal centres, and the three external centres.

www.icoachmath.com/math_dictionary/collinear.html

Definition Of Collinear. Three or more points that lie on the same straight line are called to be Collinear. More about Collinear. Three points (x i , y i , z i), where i = 1, 2, 3, are collinear if x 2 - x 1 : y 2 - y 1 : z 2 - z 1 = x 3 - x 1 : y 3 - y 1 : z 3 - z 1.

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

The notion of line or straight line was introduced by ancient mathematicians to represent straight objects ... Three points are said to be collinear if they lie on the same line. Three points usually determine a plane, but in the case of three collinear points this does not happen.