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no 35
I. 12 x 12 x 5 = 144 x 5 = 720
II. 12 x 12 x 2 = 144 x 2 = 288
III. 36 x 12 x 3 = 36 x 36 = 1296
IV. 12 x 12 x 2 = 144 x 2 = 288
total
720 + 288 + 288 + 1296
720 + 576 + 1296
2592(B)
= 6 x 144
= 864
luas 2 = 2 (p*l) + 2 (p*t) + 2 (t*l)
= 2 (36 x 12) + 2(36 x 12) + 2 (12 x 12 )
= 2 (432) + 2 (432) + 2 (144)
= 864 + 864 + 288
=2016
luas 1 + luas 2 = 864 + 2016
hasil = 2880 karena bolong 1 maka dikurangi dgn 144 = 2736 cm2
144 itu berasal dari luas persegi dari 12 x 12