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=7,84 x 5
= 39,2
mengapa dikali 5? karena ada empat sisi tembok dan 1 langit2. dan lantainya tidak di cat.
39,2 x 1/2
= 19,6 gram
= 4.2,8²
= 4. 7,84
= 31,36
Cat = 31,36 . 1/2
= 15,68
maaf kalau salah