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Answer:
198 [m²].
Step-by-step explanation:
1) required area can be calculated as four area of the triangle PQT:
A=4*A(ΔPQT);
2) A(ΔPQT)=0.5*PT*QT, then
3) A=4*0.5*PT*QT; ⇔
A=2*PT*QT; ⇒
4) finally,
A=2*11*9=198 [m²].