Distance Between Two Points

What is the distance between points (1,2) & (7,10)?
What is the distance between (-2,1) & (1,5)?
Given any two points in the coordinate plan, ( x[sub]1[/sub], y[sub]1[/sub]) & ( x[sub]2[/sub], y[sub]2[/sub]), how can you find the distance between these two points? Explain your formula.
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Information: Distance Between Two Points