Question 627883
d = sqrt((x2-x1)^2+(y2-y1)^2)



d = sqrt((3-21)^2+( 8-( -30))^2)



d = sqrt((3-21)^2+( 8-( -30))^2)



d = sqrt((-18)^2+(38)^2)



d = sqrt(324+1444)



d = sqrt(1768)



d = 2*sqrt(442)



So exact distance between the two points is  2*sqrt(442)  units.


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