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Area inicial =bh=360
Perimetro=P=2(b+h)
Area nueva = Area inicial
(b+10)(h-6) = 360
bh - 6b + 10 h - 60 = 360
10h - 6b = 60 → 5h - 3b = 30
b = 360/h
5h² - 1080 = 30h
5h² - 30h - 1080 = 0
h² - 6h - 216 = 0
(h- 18)(h+ 12) = 0 → h = 18 m
b = 360/h = 360/18 = 20 m
P = 2(20+18) = 76 m