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semoga bermanfaat
sisi a + sisi b + sisi c = 28
yang memnuhi, cek satu2
a) 12 + 6 + 9 = 27 cm, bukan
b) 13 + 7 + 9 = 29, bukan
c) 13 + 7 + 8 = 28, jawaban<========
d) 15 + 10 + 7 = 32, bukan