Hi,

Distance between two points (x1,y1) and (x2,y2) is:

D = 

p1=(-1,3) 

p2=(5,4)  d =  

0r

p2=(5,4)

p1=(-1,3) d =  

Note: the Right Triangle Formed:

Applying the Pythagorean Theorem to find length of the blue line



 

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