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

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Intros

Lessons

What is the Distance Formula? How to use it?

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Examples

Lessons

Determine the distance between each pair of points.
1. $A(4, 2)$ & $B(6 , 8)$
2. $A(-2.5, -4)$ & $(-8, 4)$
Determine the diameter of the circle with centre $(-4,8)$ which passes through $(5,-4)$ .

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