For two points $A(x_1,y_1)$ and $B(x_2,y_2)$, the distance between $A$ and $B$ is
\begin{equation*}
AB = \sqrt{(x_2-x_1)^2+(y_2-y_1)^2}
\end{equation*}
Resources for HKDSE Mathematics
Resources for HKDSE Mathematics
For two points $A(x_1,y_1)$ and $B(x_2,y_2)$, the distance between $A$ and $B$ is
\begin{equation*}
AB = \sqrt{(x_2-x_1)^2+(y_2-y_1)^2}
\end{equation*}
