Identify the coordinates of the two points: ((x_1, y_1)) and ((x_2, y_2))
Use the distance formula:
(d=sqrt{(x_2-x_1)^2+(y_2-y_1)^2})
For 3D points ((x_1, y_1, z_1)) and ((x_2, y_2, z_2)), use:
(d=sqrt{(x_2-x_1)^2+(y_2-y_1)^2+(z_2-z_1)^2})
Substitute the coordinates into the formula
Square the differences, add them, and take the square root
The result is the distance (d) between the two points