15. Calculate the sides of the right angled triangle

The points $A(28,40)$, $B(-8,20)$ and $C(12,-16)$ in order are the vertices of a Right-angled triangle. The Right-angled triangle satisfy the ${\mathit{AB}}^2+{\mathit{BC}}^2={\mathit{AC}}^2$. Verify this and calculate the side of the triangle using the distance formula.

 

 

$AB =$ $\sqrt{i}$.