The formula The distance between two points $A(x_1, y_1)$ and $B(x_2, y_2)$ is: $$ d = \sqrt{(x_2 – x_1)^2 + (y_2 – y_1)^2}. $$ In other words, subtract the $x$-coordinates and the $y$-coordinates first. Then, we square both, and add them. Finally we take the square root of the sum. Here’s a worked example: Find…

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