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Find the distance between the points: P(...

Find the distance between the points: `P(-6,7)` and`Q(-1,-5)` `R(a+b , a-b)` and `S(a-b-b)` `A(a t1 2,2a t_1)` and `B(a t2 2,2a t_2)`

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The distance between points` (x_1,y_1)` and `(x_2,y_2)` is given by
`sqrt[(x_2-x_1)^2+(y_2-y_1)^2]`
Thus, using distance formula, we have
`AB=sqrt[(-6+1)^2+(7+5)^2]=sqrt[25+144]=sqrt(169)=13`
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