If we consider what the distance formula really tells you, we can see the similarities. It is more than just a similar form.
The distance formula is commonly seen as:
##D = sqrt((x_1 – x_2)^2 + (y_1 – y_2)^2)##
We commonly write the as:
##c = sqrt(a^2 + b^2)##
Consider the following major points (in Euclidean geometry on a Cartesian coordinate axis):
What do you see in these formulas? Have you ever tried drawing a triangle on a Cartesian coordinate system? If so, you should see that these are two formulas relating the diagonal distance on a right triangle that is composed of two component distances ##x## and ##y##.
Or, we could put it another way through substitutions based on the distance definitions above. Let:
##x_1 – x_2 = pma##
##y_1 – y_2 = pmb##
(depending on if ##x_1 > x_2## or ##x_1 < x_2##, and similarly for ##y##.)
Now what do you see? An equivalence.
##D = color(blue)(sqrt((pma)^2 + (pmb)^2)) = c = color(blue)(sqrt(a^2 + b^2))##
In short, the distance formula is a formalization of the Pythagorean Theorem using ##x## and ##y## coordinates. In other words, they are the same thing in two seemingly different contexts.
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