Question

Diameter with endpoints (3,12)and (9,4)

Answer 1

and you need to know how long it's? use \(\large {\begin{array}{lllll}
&x_1&y_1&x_2&y_2\\
&(3\quad ,&12)\quad &(9\quad ,&4)
\end{array}
\\\quad \\
\text{distance between 2 points}\\
d = \sqrt{(x_2-x_1)^2 + (y_2-y_1)^2}}\)