You can use the distance formula to calculate the distance between two points:
d = √(x2 - x1)2 + (y2 - y1)2

So to find the distance between 3 points:

Calculate the distance between points 1 and 2
Calculate the distance between points 2 and 3
Calculate the distance between points 1 and 3

Those 3 distances form the sides of a triangle, and you can use that to calculate various properties of the triangle if needed.
For example:
point1 = (1, 2)
point2 = (4, 6)
point3 = (7, 8)

d12 = √(4 - 1)2 + (6 - 2)2 = 5
d23 = √(7 - 4)2 + (8 - 6)2 = 4
d13 = √(7 - 1)2 + (8 - 2)2 = 7

So the 3 sides of the triangle are 5, 4 and 7 units.
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