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(panjang x lebar) + 2(lebar x tinggi) + 2(panjang x tinggi)
(40 x 36) + 2(36 x 20) + 2(40 x 20)
1.440 + 1.440 + 1.600
4.480
maka yg dicat = 4.480 cm²
= 40 x 36 + 2 (36 x 20 ) + 2 ( 40 x 20 )
=1440 + 1440 + 1600
=4480 cm^ 2
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