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-3/3 = 5/c
-3c = 15
c = -5
4) E. Sembarang
Nb : jawaban no.4 masih ragu ragu
100 = 64 + 36 + (c-5)^2
0 = c-5
c = 5
4) C. Sama sisi
Panjang vektor AB=BC=AC