Question

Please help me find the perimeter of this triangle please

Answer 1

$\bf \textit{distance between 2 points}\\ \quad \\ \begin{array}{lllll} &x_1&y_1&x_2&y_2\\ % (a,b) C&({{ 1}}\quad ,&{{ 9}})\quad % (c,d) B&({{ 7}}\quad ,&{{ 1}}) \end{array}\qquad % distance value d = \sqrt{({{ x_2}}-{{ x_1}})^2 + ({{ y_2}}-{{ y_1}})^2} \\\\\\ CB=\sqrt{(7-1)^2+(1-9)^2}\implies CB=\sqrt{6^2+(-8)^2} \\\\\\ CB=\sqrt{36+64}\implies CB=\sqrt{100}\implies CB=10$

add the sides with 8 and 6 to it, and that's the perimeter.