Pada segitiga ABC, AB=BC. Sisi AC diperpanjang melewati cke d sehingga AB-CD. Diketahui mABC-128°, hitunglah mBDC!
A. 11°
B. 13°
C. 15°
D. 20°
E. 30°
A. 11°
B. 13°
C. 15°
D. 20°
E. 30°
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