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a . lebar balok
b. volume balok
diket
luas perm = 392 cm2
p=12 cm
t=5 cm
ditanya : l , dan V
luas perm = 2( pl + pt + lt) = 392
= 2(12l + 12.5 + 5l ) = 392
17l + 60 = 196
17l = 136
l = 136/17 = 8 cm
v = p l t = 12 . 8 .5 = 480 cm3
Lp = 392 cm2
p =12 cm
t =5 cm
Ditanya : Lebar dan Volume ?
Lp = 2( pt + pt + lt)
= 392
= 12 + 5 + 12 + 5 + 5 = 392
= 17 + 17 + 5
= 34 + 5 = 39
17 = 34
lebar = 34/17
= 8 cm
Volume = p . l . t
= 12 . 2 . 5
= 120 cm^3