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P= 15
jadi, setiap perbandingan di kali 5
P=15
L=10
T=20
luas permukaan: 2 X P X L = 2 X 15 X 10 = 300
2 X P X T = 2 X 15 X 20 = 600
2 X L X T = 2 X 10 X 20 = 400
300 + 600 + 400= 1300 cm2
B.1300
semoga membantu :)