HSTU-A_19-20BSMRSTU-A_19-20BRU-A_17-18MBSTU-A_16-17RU-A_16-17JU-A_15-16SAU_14-15PUST-A_14-15JUST-A_13-14RU-A_10-11

ABCABC ত্রিভুজে a:b:c=3:7:5a: b: c=3: 7: 5 হলে B=?\angle B=?

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