college algebra do not understand it
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triangel...add length av 3 sides

points: (-1,6)  (0,-1)  (7,0)

side 1=tween first 2 points:

deltax=0 -(-1)=1   square=1

deltay=-1 -6=7    square=49

line leng=square root av sum av squares

length 1=root(50)=7.071067812

Go round triangel & get leng2=7.0710678 & side 3=10

rim length=sum av 3 side lengths=24.14214
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