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17, 15, pasti sama 8
jadi luas permuakaan = luas alas.2 + luas selimut
Lp = 1/2.8.15.2 + 20.17 + 20.15 + 20.8
Lp = 120 + 340 + 300 + 160
Luas permukaan = 920 cm² (C)
klo nyari volumenya tinggal luas alas x tinggi
v = 1/2.8.15.20
volume = 1.200 cm³