The points A, B, and C are collinear if AB + BC = AC.

Three points A, B, and C are the vertices of an equilateral triangle if AB = BC = CA.

Points A, B, and C are the vertices of an isosceles triangle if AB = BC or BC = CA, or CA = AB.

Three points A, B, and C are the vertices of a right triangle if the sum of squares of any two sides is equal to the square of the third side.

## Distance Formula PDF

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