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p= 20 cm
l= 12 cm
t=16 cm
Lp Balok = 2(p.l) + 2(l.t) + 2(p.t)
= 2(20.12) + 2(12.16) + 2(20.16)
=480 + 384 +640
= 1504
maaf ya kalo salah