p=3m, leb=400cm, t=500cm. berpakaian luas nya, pakai jln

p = 3m
l = 400cm = 4m
t = 500cm = 5m

L = 2(p.l) + 2(p.t) + 2(l.t)
= 2(3.4) + 2(3.5) + 2(4.5)
= 2(12) + 2(15) + 2(20)
= 24 + 30 + 40
= 94 m^2

Semoga membantuu :)