Answer:
Applying Pythagoras?s theorem, in\[\Delta PQR\], we have \[P{{R}^{2}}=P{{Q}^{2}}+Q{{R}^{2}}\] \[={{\left( 12 \right)}^{2}}+{{\left( 35 \right)}^{2}}\] = 144 + 1225 \[=\text{ }1369\Rightarrow PR\text{ }=\text{ }\sqrt{1369}\] PR = 37 m
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