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54 = 21 + 18 + sisi 3
54 = 39 + sisi 3
54 - 39 = sisi 3
15 = sisi 3
maaf kalau salah, semoga membantu :)
54 = 21 + 18 + c
54 = 39 + c
c = 54 - 39
c = 15
c itu panjang sisi ketiga