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Luas Permukaan = 2.π.r²
= 2 . 22 . 14²
7
= 2. 22 . 196
7
= 1232 m²
JADI, BIAYA YG DIPERLUKAN UTK MENGECAT ATAP TSBT ADLH =
1232 m² x Rp 25.000,00 = Rp 30.800.000,00
= 1/2 x 4 x 22/7 x 14 x 14
= 2 x 22 x 2 x 14
= 88 x 14
= 1232
biaya = 1232x 25.000
= 30.800.000
jawabnnya adalah Rp 30.800.000,00