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Garis dan Sudut.sudut EFC dan sudut FCD besarnya sama karena sudut dalam berseberangan.
sudut EFC = sudut EFB + sudut BFC.
EFC = FCD.
EFB + BFC = FCD.
65° + BFC = 120°.
BFC = 120° - 65°
BFC = 55°.
jawabannya adalah (b) 55°.