Jawab pake dengan benar
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= (2 x (15+9) x 20) + ((15x9) x 2)
=960 + 270
= 1230
2. L permukaan = (kel alas x t) + (luas alas x 2)
=(12+16+20) x 25)) + (1/2 x 12 x
20) x 2))
=1200 + 240
= 1440