[tex]Pp=ab\\Pp=108cm^2\\a=9cm\\9cm*b=108cm^2 /:9cm\\b=12cm\\\\a^2+b^2=d^2\\81cm^2+144cm^2=d^2\\d^2=225cm^2\\d=15cm\\\\D=25cm\\\\d^2+H^2=D^2\\225cm^2+H^2=625cm^2\\H^2=400cm^2\\H=20cm\\\\Pb=2aH+2bH\\Pb=2*9cm*20cm+2*12cm*20cm=360cm^2+480cm^2=840cm^2[/tex]
