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169 = (17 + sisi2) x 13 / 2
169 x 2 / 13 = 17 + sisi2
26 = 17 + sisi2
sisi2 = 26-17 = 9 cm
169 = (17 + a) x 13 / 2
169 x 2/13 = 17 + a
26 = 17 + a
26-17= a
9 = a
atas (a) adalah 9 cm