Ta có: \(\cot Q=\frac{AQ}{AB} \Rightarrow AQ = AB\cot48^0\)
Tương tự có: \(AP = AB\cot35^0\)
\(\Rightarrow QP =AP-AQ\)\(= AB(cot35^0- cot48^0)\)
\(\Rightarrow AB = {{300} \over {\cot {{35}^0} - \cot {{48}^0}}} \approx {{300} \over {1,4281 - 0,9004}} \)\(\approx 568,457m.\)