We have information on the hypotenuse, now we must calculate the sides.
Using the x-coordinates of the points of the hypotenuse we obtain
1 - (-8) = 9
Using the y-coordinates of the points of the hypotenuse we obtain
3 - (-9) = 12
Now lets graph
Distance
[tex]\begin{gathered} d=\sqrt[]{9^2+12^2} \\ d=15 \end{gathered}[/tex]The distance would be 15