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K = 28 CM
mka :
K = 4 x sisi
28 = 4 x sisi
sisi = 28/4
sisi = 7 cm
jadi :
L per sisi = 7 x 7 = 49 cm²
krn sisi kubus ada 6, maka :
L semua sisi = 6 x 49 = 294 cm²
= 7 cm
lsp kubus = 6 ( sxs )
= 6 ( 7cm x 7cm )
= 294 cm²
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