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p×l×t = 5400
25×18×t = 5400
450×t = 5400
t = 5400:450
t = 12 cm
Lp = 2×(pl+pt+lt)
Lp = 2×(25×18+25×12+18×12)
Lp = 2×(450+300+216)
Lp = 2×966
Lp = 1932 cm2