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The parametric equations

$x=x_1+(x_2-x_1)t,y=y_1+(y_2-y_1)t$

where $0t1$ describe the line segment that joins the points $P_1(x_1,y_1)$ and $P_2(x_2,y_2).$ comma$-$separated list of equations. Let $x$ and $y$ be in terms of $t$ from $0$ to $1.)$

$AB$

$BC$

AC $$

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