geometry pre- ap

\(d = {\sqrt{(x_2 - x_1)^2+(y_2 - y_1)^2} }\)

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Guest #1's answer is correct but he/she didn't state what is mean by what.

d is the distance

x₁ is the x-coordinate value of the 1st point(You can choose any point as your first point.)

x₂ is the x-coordinate value of the 2nd point(It is just another end-point of the line segment.)

y₁ is the y-coordinate value of the 1st point

y₂ ​is the y-coordinate value of the 2st point

It is just an application of Pythagorean theorem but it is really useful.