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400 = 4.S^2
S^2 = 100
S = 10
misalkan, sisi miring = x
x^2 = 12^2 + 5^2
x^2 = 144 + 25
x^2 = 169
x = 13
Luas alas = S^2
= 10^2
= 100
Luas permukaan limas = 10^2 + 10.13/2.4
= 100 + 260
= 360