در شکل، اندازه پاره خط AD کدام است؟
\(\sqrt {160} \)
\(\sqrt {170} \)
\(\sqrt {180} \)
\(\sqrt {190} \)
\(\begin{array}{l}A{D^2} = {\left( {6 + 5} \right)^2} + {\left( {4 + 3} \right)^2} = {11^2} + {7^2} = \\\\121 + 49 = 170\,\,\, \Rightarrow \,\,\,AD = \sqrt {170} \end{array}\)