Question 974231
The 92 m^2 will be (7+x)(12+x) to accommodate the border

84+19x+x^2=92

x^2+19x-8=0

x= (1/2) -19+/- sqrt (361+32), and the minus root won't make sense.

x=(1/2) (-19)+19.8242=0.4121 m

7.4*12.4=91.76, so this is a reasonable answer.