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jadi dipisah aja
bangun pertama
2 x (P+L)
2 x (15+5)
2 x 20 = 40
bangun kedua
2 x (P+L)
2 x (15+5)
2 x 20 = 40
bangun ketiga
2 x (P+L)
2 x (10+5)
2 x 15 =30
totalin deh
40+40+30 = 110
= 10 + 60 + 20
= 90