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Karna disini tdk diketahui panjang rusuk maka sy gunakan permisalan, misal panjang rusuk nya = 6cm. Maka,
Pada segitiga GCT, GC = 6cm, maka TC = 3√2
GT = √38 + 18 = 3√6
CT.CG = GT.CC' ---> CC' = CT.CG / GT = 3√2.6 / 3√6 = 2√3cm
Itu kalau panjang rusuknya 6cm ya. Semoga membantu :)