- #1

daniel_i_l

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Thanks.

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- Thread starter daniel_i_l
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- #1

daniel_i_l

Gold Member

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Thanks.

- #2

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- #3

Integral

Staff Emeritus

Science Advisor

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Ah... No.

Parallel lines have the same slope, but never intersect.

Find the equation of a line between 2 of the points.

Do the other points satisfy the equation? If so, they are on the line.

- #4

AlephZero

Science Advisor

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Area of the triangle defined by the 3 points = 0

Vector cross product of two vectors joining the points = 0

If the points have position vectors

- #5

AlephZero

Science Advisor

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Parallel lines have the same slope, but never intersect.

True, but in d_leet's method the two lines always intersect because they have a common point.

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