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144 = s^2
s = 12
r = 12
r : t = 3 : 2
12 : t = 3 : 2
t = 12.2/3 = 8
sisi miring = √8^2 + 6^2
= √64+36
= √100
= 10
luas alas = 144 cm^2
luas sisi tegak = 12.10/2.4 = 240 cm^2
luas permukaan limas = 144 + 240 = 384 cm^2