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Xqp=Xq-Xp=4-(-2)=6
Yqp=Yq-Yp=5-1=4
r^2= Xqp^2 + Yqp^2
r^2 = 6^2 + 4^2
r^2 = 36 + 16
r^2 = 52
r =akar 52
r = 2 akar 13