PreCal
posted by nelly .
Find the distance d(P1,P2) between the points P1 and P2.
P1= (2,1); P2= (0,0)
P1= (1,1); P2= (2,2)
P1= (1,0); P2= (2,4)
P1= (2,3); P2= (4,2)

You should know the distance formula
I will do the 2nd, you do the others
Distance = √( 2(1))^2 + (21)^2 )
= √( 3^2 + 1^2)
= √(9+1)
= √10
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