malificent

Wait — perhaps I made error in area.

Alternative: maybe the inner area is 240, so solve numerically:

Let x = 0.9: (20-1.8)=18.2, (15-1.8)=13.2, 18.2×13.2 = 240.24 ≈ 240 (close enough for company fence).

x=0.91: 19.18×13.08≈250.2 — worse.

So x≈0.9. But 18.2×13.2= let's compute: 18×13.2=237.6, 0.2×13.2=2.64, total 240.24.

x=0.89: 19.22×13.22≈19.22×13.2=252.636, minus 19.22×0.02≈0.384, so 252.252 — too high.

Try x=0.92: 19.16×12.96≈19.16×13=249.08, minus 19.16×0.04≈0.766, so ~248.3 — too low.

Wait, 20-1.84=18.16, 15-1.84=13.16, 18.16×13.16.

18×13.16=236.88, 0.16×13.16≈2.1056, total 238.985 — less than 240.

So between 0.89 and 0.9.

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