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5292 = 18.14.t
5292 = 252.t
t = 5292 / 252
t = 21
Lpermukaan = 2(pl+pt+lt)
= 2(18.14+18.21+14.21)
= 2(252+378+294)
= 2(924)
= 1848 cm²
maaf kalau salah hitung
5292=18x14xt ..... t= 21
permukaan balok l= 2( px+pt+bt)=2(18x14+18x21+21x14)=2(924)= 1848 cm2