0

8

9

7

 $d=\sqrt{\left(y_2-y_1\right)^2+\left(x_2-x_1\right)^2}$  

 $d=\sqrt{\left(y_1-y_2\right)^2+\left(x_1-x_2\right)^2}$  

 $d=\sqrt{\left(y_2-y_1\right)_{\ }^2-\left(x_2-x_1\right)^2}$  

 $d=\left(y_2-y_1\right)^2+\left(x_2-x_1\right)^2$  

$\sqrt{\left(-2-3\right)^2\ +\ \left(-1-1\right)^2}$

$\sqrt{\left(1-3\right)^2\ +\ \left(-1-2\right)^2}$

$\sqrt{\left(-2-3\right)^2\ -\ \left(-1-1\right)^2}$

$\sqrt{\left(-2-3\right)^2\ -\ \left(-1-1\right)^2}$

$d\ =\ \sqrt{\left(4-2\right)^2\ -\ \left(0-2\right)^2}$

$d\ =\ \sqrt{\left(4-0\right)^2\ -\ \left(-2-2\right)^2}$

$d\ =\ \sqrt{\left(-2\ +0\right)^2\ +\ \left(4+2\right)^2}$

$d\ =\ \sqrt{\left(-2-2\right)^2\ +\ \left(4-0\right)^2}$