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Ltembok = 2,8 x 2,8 = 7,84 m² x 4 = 31,36 m²
tinggi = 2,8 m
ada 4 sisi y dicat
maka :
Luas = 4 x sisi²
= 4 x 2,8²
= 4 x 7,84
= 31,36 cm²