B =180-A-C =180-84-64 =32
BCC1 =C/2 =64/2 =32
B=BCC1
△BC1C - равнобедренный
BC1=CC1 =7 (см)
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B =180-A-C =180-84-64 =32
BCC1 =C/2 =64/2 =32
B=BCC1
△BC1C - равнобедренный
BC1=CC1 =7 (см)