question_answer 18)

Angles Q and R of a \[\Delta PQR\] are \[\text{2}{{\text{5}}^{o}}\] and \[\text{6}{{\text{5}}^{o}}\]. Write which of the following is true: (i) \[P{{Q}^{2}}+Q{{R}^{2}}=R{{P}^{2}}\] (ii) \[P{{Q}^{2}}+R{{P}^{2}}=Q{{R}^{2}}\] (iii) \[R{{P}^{2}}+Q{{R}^{2}}=P{{Q}^{2}}\]                

Answer:

                (ii) \[\text{P}{{\text{Q}}^{\text{2}}}+\text{R}{{\text{P}}^{\text{2}}}=\text{Q}{{\text{R}}^{\text{2}}}\] is true.