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s² = 196
s = √196
s = 14 cm
jumlah rusuk tegak = 4t
4t = 100
t = 100 / 4
t = 25 cm
luas permukaan limas = 2 * luas alas + 4 * luas sisi
= 2 * 196 + 4 * 25 * 14
= 392 + 1400
= 1792 cm²