Distance between 2 points

Find the distance between the points (7, -9), (-1, -9)

Correct result:

d =  8

Solution:

x0=7 y0=−9  x1=−1 y1=−9  d=(x1−x0)2+(y1−y0)2=((−1)−7)2+((−9)−(−9))2=8

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