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panjang : lebar : tinggi = 4 : 3 : 1
Lebar = 21
Ditanya : panjang, lebar dan volume
panjang : 4/3 . 21 = 28
tinggi : 1/3 . 21 = 7
volume : p.l.t = 28 . 21 . 7 = 4116
maaf kalo salah
rasio p:l:t = 4:3:1
Dit. p dan t
p = 4/3 x 21 = 28
l = 1/3 x 21 = 7
panjangnya 28cm, tingginya 7cm. (A)
luas = p x l x t = 28x21x7 = 4116cm³ (B)